What was found
COULD NOT START EITHER ENGINE WITH APU AIR, AIR CONDITIONER WORKS. ACFT GROUNDED. INSPECTED WING ANTI-ICE VALVES, COWLING ANTI-ICE VALVES ALSO PCA DOOR FLAPPER VALVE NO FAULTS FOUND. CONNECTED GROUND AIR SOURCE, NR 1 ENGINE DID NOT STAR WITH GROUND AIR SOURCE. STARTED NR 2 WITH GROUND AIR SOURCE, CYCLE COWL ANTI-ICE VALVES AND WING ANTI-ICE VALVES WITH NR 2 ENG RUNNING. SUSPECT WING ANTI-ICE VALVES STUCK OPEN. SHUTDOWN NR 2 AND RESTARTED BOTH ENGINES WITH APU AIR. GROUND START SUCESSFUL WITH APU AIR SOURCE. SHUTDOWN BOTH ENGINES AND RE-STARTED APU AIR SOURCE. BOTH ENGINES GROUND VERIFICATION SUCCESSFUL WITH APU SOURCE. TECH SERVICE REQUESTS REPLACEMENT OF LT WING ANTI-ICE SHUTOFF VALVE. RT & LT WING ANTI-ICE SHUTOFF VALVE IAW AMM 30-11-11. OPS CK AND LEAK CK GOOD. NO DEFECTS NOTED.