As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T.C. #78233001. 1 EMERGENCY LT BATT PACK WAS INOP, FAILED CAPACITY FUNC CHECK. GROUNDED - YES. PER T.C. #78233001, REMOVED AND REPLACED M1673 IAW AMM 33-51-06-960-805. NEW BATT FROM STOCK CHECKS GOOD IAW AMM 33-51-00-720-801. T.C. COMPLETE. OK FOR SERVICE.