Many repairs can be made by me, on many instruments. Many other types of gears (electric, electronics, pedals etc...) can be repaired or upgraded, but will be sent to third parties or refereed to other experts in the field.
Contact Claude Lassonde, 514-685-0298
As an example of a possible referred specialist, read the article from Claude Lassonde on changes made by Michel Lemieux on different amplifiers :
Amptek, Mojo Tone