Schematic for BK Precision 2831D or similar?

[klr5205]

I was wondering if anyone had access to a schematic or repair manual for a BK Precision 2831D? I emailed their technical support hoping they wouldn't mind giving out a schematic or service manual for an obsolete product, but I never even got a response.

I bought one for $5 at auction and its in need of some repair. It's about 80% functional but there are a few resistance and current ranges that do not work.

I've only just begun my research so all I can say so far is that I don't believe it to be a simple blown fuse because some ranges on both the 2000mA and 20A jacks do work.

Some documentation would be best but I'd be happy to hear any words of wisdom before I tear into it one of these days!