What was found
INSUFFICANT AIR TO START ENG, ENG START UNSUCCESSFUL WITH HUFFER AT 25 PSI. ACFT GROUNDED. OPENED NR 2 ENGINE & INSPECTED PRSOV & FOUND IN CLOSED POSITION. CLOSED NR 2 ENGINE. DUCT DOWN STREAM OF RT PACK SOV WAS HOT WITH PACK SW IN OFF POSITION. DISCONNECTED, CONNECTOR PLUG AT NR 2 STARTER & PLACED START SWITCH TO GROUND. APU WENT TO HIGH MODE & RT PACK VALVE CLOSED COMPLETELY. RECONNECTED NR 2 STARTER CONNECTOR PLUG & ACCOMPLISHED 2 DRY MOTOR RUNS TO 29 PERCENT N2 BOTH ENGINES. RT PACK VALVE OPS CHECKED ON GROUND. OPS CHECK GOOD. GROUND VERIFICATION COMPLETED. BOTH ENGINES SPOIL UP TO 29 PERCENT N2.