As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - ON PDC, FOUND #1 ENG AIR/OIL HEAT EXCHANGE 4073265 LEAKING OIL INTERNALLY. // REMOVED #1 ENG AIR/OIL HEAT EXCHANGER PER AMM 79-21-51-000-803-A 13 FEB 2021 INSTALLED #1 ENG AIR OIL HEAT EXCHANGER PER AMM 79-21-51. OPS CHECK AND LEAK CHECK GOOD. COOLER, OIL-AIR OFF 43-7921-9-0001 41387 ON 43-7921-9-0001 41492