Hi Bob,
I don't use the unit much any more after I got an Axe8 but when I do it still works fine.
I'm really out the door at work these days and I won't find time to do a step by step any time soon. What I can tell you is that if your confident in your abilities in the tinkering and repairs department you will not find this difficult. There are 8 screws on the rubber foot pads. Remove these first. There are then 2 more in the middle of the base. I'm not sure you need to remove these as they might be just to stop flexing when pressing foot switches so leave them until last. There are a further two on the two ends of the jack socket panel. Remove these too. The two halves should separate then. If not remove the two screws in the middle of the base. I have to say that I recall the design lacked some finesse insofar as some of the screws are in fact bolts and the nuts are not 'captive' in the chassis. So loosening a bolt can mean the nut falls into the enclosure. The hex bolts on the foot switches themselves are of this type so you have to keep an eye on both ends to see what's happening and when re-assembling. Look through the side of the unit to see the action of pressing a foot switch and the contact point with the surface mounted switch. I tested the surface mounted switches at this point but the power must be connected There is no mains connected directly to the board and the transformer supplies only about 20V so its safe. Using the flat side of a small screwdriver to press on the surface mounted switch will tell you if the switch is in fact working by viewing the display. The plunger that makes contact with the switch is what you must modify by lengthening it (0.75 mm I used and just cut from a plastic box ). A hole punch ( https://www.youtube.com/watch?v=RHxPauiCg-0) like the one in the link is what I have and 4mm width is about right. I superglued the 4mm pad to the end of the plunger shaft which is also ~ 4mm in diameter. I will caution here that adding too thick a piece of plastic to the end of the plunger will damage the surface mounted switch by putting too much pressure on it. 0.75 was a judgement on my behalf and was what I had to hand. You need to make sure once the pad is added, that the pcb with the surface mounted switch is not flexing and the switch is not deforming. Might be a good idea to use a less permanent glue than superglue to test the operation of different pad thicknesses to optimise before finally fixing. You'd expect that all the switches should use the same thickness pad but that may not be the case. The foot switch removal from the top panel is fiddly as I remember and there are a number of parts sandwiched together, the jewel for the led is plastic and separate if I recall correctly and there is a spring inside the foot switch. You may need a miniature socket set to hold the nuts in place when reassembling the foot switches.
I think in hindsight I did this to see if the process would work and it does but it might be easier to actually remove the entire pcb for the row of five switches for easier access to the foot switch plungers. I'm not sure but I think this way you don't need to remove the foot switches from the top panel as the plungers are accessible and you get to do five at a time and its simpler to test the actual surface mounted switches too.
The usual caveats apply here Bob. I take no responsibility for anything you do in relation to the above information and its hard not to sound patronising here but if you have good hands and a bit of savvy you'll have no problem otherwise get a techie to do it for you.
If you''re doing it yourself I'll be glad to help out further. You can send me a photo of the inside if you need any further info. I like this unit a lot and the repair is definitely worth it.
Best regards
Ed