What was found
(CAN) DURING CRUISE C/B B247 (HYD FAN CONTROL)POPPED. AT THAT TIME THERE WERE NO FAULTS OR MASTER CAUTION LIGHTS. C/B WAS RESET AND POPPED AGAIN. THEN THE LT ENGINE 10TH STAGE AIR LIGHT ILLUMINATED. CREW TRIEDTO OPERATE 10TH STAGE VALVE, BUT THE LIGHT STAYED ON. TEN MINUTES LATER CREW NOTICED NR 3 HYD QUANTITY SLOWLY GOING DOWN. MAINTENANCE CHECKED WITH NO LOSS OF FLUID FROM NR 3 SYSTEM. FURTHER INVESTIGATION FOUND WIRE BUNDLES FROM CONNECTORS P76 & P80 BURNT TO THE EXTENT SEVERAL WIRES WERE BARE AND BURNT THROUGH. NO SIGH OF CHAFING WAS FOUND. WIRE SHIELDING FROM ONE OF THE WIRES IN THE BUNDLE SHORTED.