As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER CENTER TANK EMPTY FUEL CROSSFEED VALVE OPEN LIGHT BEGAN FLASHING BRIGHT BLUE. FUEL CROSSFEED VALVE CYCLED OPEN AND CLOSED AND OBSERVED NORMAL VALVE POSITION INDICATIONS. LIGHT FLASHED SEVERAL MORE TIMES AFTER VALVE OPERATION. GROUNDED - YES. OPERATED CROSSFEED SEVERAL TIMES, CHKS NORMAL. GROUND OPS CHK GOOD PER FIM 28-22 TASK 801.