Looking for guide for refurbishing SS amps

[mops]

Hello.
I have an old Muntz X-1000 amp with am/fm reciever, that kinda goes, but has several problems:

-power supply bottoms out at quite low level (that invlovel bass)
-channels seem to me mixed together (sounds kinda like mono, as both are playing the same stuff)
-adjusting any controls give out poping and cracking noises.

I woyuld like to refurbish this amp to fix the mentioned problems.

I looked around the net but i could not find any "refurbishing solid state amp guide" anywhere.

I'm not an electronic pro, but i know how to solder and use multimeter, and if I had a comprehensive guige on how to go about it, I'll definitely attempt to refurbish this amp.

Could anyone point me out to a good guide located on the internet or recommend a book that would get me started ?

thanks in advance.
Matthew.