As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: FUEL CENTER TANK SHOWS LEAK FROM LEFT MIDDLE SIDE OF THE KEEL BEAM AREA. DESEALED, CLEANED AND RESEALED INTERNAL CENTER TANK AT FORWARD SIDE OF RIB 6. FROM LEFT WING RIB 1 TO RIGHT WING RIB 1. PERFORMED SATISFACTORY LEAK CHECK, NO LEAKS NOTED. PER B737 AMM 28-11-00.