As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MOTORING RT ENG CAUSED LT SYS PRESS TO DROP TO 20 PSI, LT ELEC DEMAND PUMP SHEDS OK FOR SERVICE IAW AMM 29 -11-00 PAGE 1 ITEM 2 B ON GROUND. THE LT SYS ACMP IS INHIBITED DURING STARTING OF EITHER ENG TO REDUCE ELEC LOADS ON THE APU GENERATOR.