I was hoping I could get some help from all of the smart Marshall folks here. I was checking out a 1985 Marshall JCM 800 Lead Series and would like to know if you folks could tell me if anything looks as if it was modified or changed out of this amp. The one thing I did notice, it looks to me like the filter caps (I believe) have dried out due to all the white residue on the unit along with the rust on them. And I was also wondering about the green and orange wires coming from I believe the OT wired to the resistors. If I recall when I built my 50 Plexi clone this is where you would be measuring to set the bias. My question on that is, do they look like the wiring has been changed or is it original. Thank you very much in advance.