As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - FOUND #1 ENGINE 3 QTS LOW. AIR OIL HEAT EXCHANGER LEAKING. REMOVED AND REPLACED #1 ENG AIR/OIL HEAT EXCHANGER PER AMM 79-21-51-000-803-A/400-800-A. OPS CHECK GOOD. OK FOR SERVICE. COOLER, OIL-AIR PN/SN OFF 43-7921-9-001 / 41490, PN/SN ON 43-7921-9-0001 / 74783.