What was found
(CAN) RPTED BY CREW THAT DIM POTENTIOMETER WAS NOT DIMMING LIGHTS FOR FLT CNTL PANELS & ANNUNCIATORS. WIRING BUNDLE BEHIND RADIO PANEL FOUND TO HAVE A BLACK DISCOLORATION. FURTHER INVESTIGATION FOUND WIRE TO BE BROKEN AS IT HAD BEEN CHAFFINGAGAINST CENTRE FORMER STATION 94. THIS WIRE IS FED FROM AVIONICS ANNUNCIATOR 5 AMP C/B THROUGH J395(E) TO P237(E) TO ANNUNCIATOR BRIGHT/DIM POTENTIOMETER SWITCH THEN TO P237(B) TO J395(B) WHICH THEN FEEDS ANNUNCIATOR DIMMING CNTL RELAY COIL . THERE WERE NO RPTS OF SMOKE & FUMES.SUBMITTER STATES THIS IS 2ND RPT WITHIN 2 WEEKS BY THIS COMPANY CONCERNING CHAFFED WIRES BEHIND RADIO AUDIO PANEL.