As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNWANTED FUEL TRANSFER. FOUND LEFT DEFUELING VALVE STICKING OPEN, SHAFT TO VLV RIG OUT OF ADJUSTMENT. REPLACED LEFT DEFUELING VALVE ACT & VALVE. ADJUSTED THE RIG OF THE VALVE TO ACTUATOR. OPS CHECK GOOD.ACCOMPLISHED MM 28-21-00-0101 PAGE 128 BLOCK 1.