As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ATTEMPTING TO START THE NR 1 ENG LEFT DUCT PRESS @ 40 PSI, ISO VALVE CLOSED, NR 1 ENG. START SWITCH ENGAGED TO GRD,AMBER START VALVE OPEN LIGHT ILLUMINATED, N2 REACHED APP 5% THEN WENT BACK TO ZERO, 0... GROUNDED - YES. REMOVED & REPLACED NR 1 ENGINE STARTER IAW AMM 80-11-01.