As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDIS 880 52-20 1013 30SEP20 MEM. L1 EPAS BATTERY UNIT TERMINALS ARE CORRODED. FACT 30SEP20 21:38 MEM 0000086819 STEVENSON, BRIAN A-30-SEP-2020 14:10. REPLACED L1 DOOR EPAS BATTERY PACK, REF B777 AMM 52-11-20-4-2. OPS CHECK GOOD. REMOVAL AND INSTALATION DONE ON B CHECK WORK ORDER 78629 NR 3. PART NUMBER INSTALLED IS 285W0955-102 REMOVED PART NUMBER 285W0955-102 S/N D07087.