As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PTY INFLIGHT T2110/18JUN LIM TO MIA. CREW REPORTED UNWANTED FUEL TRANSFER IN FLIGHT. LANDED PTY WITHOUT INCIDENT. FOUND O-RING DAMAGED AND SPLIT AT LEFT INNER PUMP NUMBER ONE FUEL FEED OUTLET MANIFOLD. REPLACED O-RING AT LT INNER PUMP NR ONE FUEL FEED OUTLET MAINFOLD. SYSTEM GROUND CHECKED NORMAL OPERATION. (A)