What was found
ATTEMPTED TO START NR 1 ENGINE, WAS SLOW TO SPOOL, EGT INDICATION STARTED FLASHING, HIT 650 DEGREES AND SHUT FUEL OFF AND MOTORED ENGINE. EVERYTHING WAS DONE IAW MTX CHECKLIST. GROUNDED - YES. CHECKED DUCTING WITH FAN COWLS OPEN & PACK BAYS OPEN. NO OBVIOUS LEAKS FOUND. AFTER STARTING ENGINES MULTIPLE TIMES WITH DIFFERENT BLEED SETTINGS, FOUND PROBLEM TO BE DURING NR 1 ENGINE START, WITH NR 2 ENG RUNNING, BOTH ENGINE BLEEDS ON, & ISOLATION VALVE IN AUTO, DUCT PRESSURE ONLY RISES TO 25 PSI WHILE TRYING TO START NR 1. THIS RESULTS IN A HUNG START. FOUND THE NR 2 ENG PRSOV & 1 BRAIDED SENSE LINE LEAKING. REMOVED & REPLACED PRSOV IAW AMM 36-11-04 & REPLACED SENSE LINE. LEAK CHECKED GOOD IAW AMM 36-11-00-700-805, & AMM 36-11-04-400-801. STARTED NR 2 ENGINE NORMALLY THEN STARTED NR 1 ENG NORMALLY WITH BOTH BLEEDS ON AND ISOLATION VALVE IN AUTO. NR 1 ENG STARTED NORMALLY. ACFT IS OK FOR SERVICE.