As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 170, FLL-BOS. DIVERTED TO JFK. OUTER TANK TO INNER TANK TRANSFER VALVE INOP ( INTER CELL TRANSFER VALVES-LH WING-BOTH LATCH CLOSED ); PERFORMED OPERATIONAL TEST OF INDIVIDUAL TRANSFER VALVES IAW AMM 28-15-00-710-002A WITH NO FAULTS NOTED. ALL INTERCELL TRANSFER VALVES AT L & R WINGS PERFORMED WITHOUT FAILURE OF ANY KIND. MX-4 UPDATED PLACARD REMOVED.