As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG MAIN OIL/FUEL HEAT EXCHANGER PAD DRAIN OVER 90 DPM PER SEAMC R&R MAIN OIL FUEL HEAT EXCHANGER. GROUNDED - YES. REMOVED & REPLACED MAIN OIL/FUEL HEATEXCHANGER PER B737-800 AMM 79-21-02, POWER PLANT TEST CONDUCTED PER AMM 79-21-02, OPS CHECK GOOD, NO LEAKS NOTED, ETOPS SIGINIFIGANT SYSTEM AND RII, GROUND VERIFICATION SUCCESSFUL.