As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMER LT SYSTEM DEEP CYCLE CHECK FOUND BAT PACK EQ NO.M737 (LH STA 980) TEST FAIL TRANSFER REF. NON-ROUTINE HX NRC WO.2019120 AND ORIGINATED BY EMP V897815 EMER LT BAT PACK EQ NO. M737 REPLACED AND TEST RESULT NORMAL AS PER AMM 33-51-07