What was found
DURING TAXI OUT, THE ENGINE ADPT HEAT 1 AND PUSHER SYSTEM FAIL CAUTION LIGHTS ILLUMINATED. AFTER A COUPLE MINUTES THE ENG ADPT HEAT 2, # 1 STALL SYST FAIL, # 2 STALL SYST FAIL, PITOT HEAT 2 CAUTION LIGHTS ILLUMINATED. FOUND CIRCUIT BREAKERS FUEL AUX PUMP 1, FUEL AUX PUMP 2 INTK LIP HTR ENG 2, INTK LIP HTR ENG 1 L WINDOW HEAT, R AOA VANE HEAT, R WSHLD HEAT, L WSHLD HEAT ALL POPPED.EMOVED FROM SERVICE. AFTER CLOSING CIRCUIT BREAKERS ONE BY ONE, SMOKE AND SPARKS AFTER THE NR 2 INTAKE HEAT CB PUSHED IN AND ALL CB ABOVE TRIPPED. FOUND ARCED AND BURNED WIRE BUNDLE UNDER PANEL 133AZ. REPAIRED DAMAGED WIRE BUNDLE, IAW WM 20-16-10-20. RETURNED TO SERVICE.