Hi: I was given a non-functioning CDM - 4/33 pickup that I'd like to fix. Does anybody have experience repairing these units? It came out of a BC 9500. From visual inspection resistors 3107 and 3108 are burned. The service manual states that these are to be replaced with identical components. 4.7 ohm 2% 1/3 resistors. Does anybody know what these