1. Take a picture of the speaker cables and how they're connected. Disconnect cables.
2. Remove top corner bumpers ( 2 screws each )
3. Remove " Line 6 " plastic nameplate ( 4 thin screws )
4. Remove 6 Black head screws from top of cabinet. Leave the handle in.
5. Slide head out through the back of the unit. ( It won't come out the front )
Lines 2 & 3 might not be necessary but I like to get everything out of the way when I'm working on mine.
Good Luck