[MATCHU101]

Good morning all, apologies if i'm stepping over the boundaries in any way, i'm a forum virgin and trying to help out a work colleague.
An old boy at work has a series 7 ferrograph that is playing him up and he uses it to play the old tunes he used to listen to back in the day with his mum when she was still alive.
He's having problems powering it up and believes there is a problem with the wire between the transformer and bridge rectifier (D700) could anybody tell me what colour the said wires are so he knows exactly what he's looking for, or even better, if there is still anybody around that services these machines?
Many thanks in advance