I have a FlexIII and it's developed a major problem with the channel vol pot. It's 3 years old approx. bought used 6mths old. The problem is correctable according to internet research but I am having difficulty removing the back-cover to get at the connections. Hopefully it just requires a spray and clean, if not I will get a new pot.

The problem shows itself by volume spikeing when changing saved channel. the vol pot needs to be reset after each tone patch has been used. It also has no audible sound change from 0-2 and after 4 the volume appears to lift the roof and requires backing off. The problem is not continuous but is increasing in regularity. There are several occurences on the internet that relate to this problem with the vol pot. Has a solutiom/fix been suggested from company?