Marshall Amp Schematic Help Needed

[col]

I "rescued" a Marshall bass amp that was being skipped at the place I practice and wondered if anyone has a copy of the shematic. It is a Marshall Bass 100 Solid State 4 x 12 combo. The circuit board says Marshall JM 1 (iss 1). This thing weighs a ton! When I took the head out it has been repaired previously very badly and there are several components missing. I know it was working approx 12 months ago and the people at the rooms have said it has not been opened so I presume that the components have just fallen out and been lost as they had been soldered to the original component leads using a very corrosive solder.
The main components that are missing or damaged are C3, C15, C23, C29 and R38.There are also points on the RHS of the board marked + and - which don't look as though they ever had anything soldered to them.
Everything else in the head looks to be in good condition including the transformer although the npn power transistor looks as though it has been replaced at some time as the insulator looks newer than the pnp one.
I suspect it may be the same as the Marshall or Park lead or bass 100 that pops up occasionally.
All resistors are the old brown Carbon comp ones and I will be using metal film. Will this matter other than reducing hiss? All the larger wattage resistors are still in place so I won't be touching them.

[dosmun]

http://www.drtube.com/marshall.htm

[col]

Thanks,

I couldn't find the particular schematic there but I managed to find all the missing parts and by matching them up to the existing wires I managed to replace everything with new. At some time in the past it had been repaired with a vastly overpowered soldering iron which had burned out some of the traces. Much of the earth trace is now direct wired along the bottom of the board.
The amp now works fine, is very loud and deep. I just need to replace one of the speakers as it has blown. It just looks as though it's been stored in a skip for months!

Col