All working again as far as all of the pots are concerned and 3 of the
pull controls change the sound. No magic smoke or anything overheating.
The pull options of
Treble- Pull shift
Master- Pull deep
Lead Drive - Pull Lead
Lead Master - Pull Bright
no change of sound. It'll be awkward if the "repairer" blew some of the
LDRs, but at least they can be checked for function with a low ps only.