As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN TANK IN FLIGHT FUEL IMBALANCE OF 1200LBS (LEFT LOW/RIGHT HIGH). BITE TEST OF M-121 FUEL QTY PROCESSOR SHOWS NO FAULTS FUEL CONFIG LIGHT DID NOT ILLUMINATE AND NO ASSOCIATED EICAS MSG IN VIEW SUSPECT 1200LB APU FUEL BURN DUE TO 4 PLUS HOUR DELAY INBD. NOTE LT ENG FUEL FLOW DEFERRED.