As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START WITH ENGINES AT IDLE LEFT DUCT PRESSURE INDICATES 8 PSI. GROUNDED - YES. PERFORMED FIM TASK 36-10-00-810-804, FOUND HIGH STAGE VALVE AND REGULATOR BAD. REMOVED AND REPLACED HIGH STAGE REGULATOR PER AMM 36-11-07. REMOVED AND REPLACED HIGH STAGE VALVE PER AMM 36-11-06. RAN ENGINES FOR GROUND VERIFICATION, CHECKED GOOD. WORK PERFORMED ON NR 1 ENGINE. GROUND VERIFICATION SUCCESSFUL.