As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATIONAL CHECK OF THE EMERGENCY POWER SUPPLY UNITS BY BITE-CHECK (PRE EA2500-03960 AND EA2500-08031, REFERENCE EC2500-04561 FOR A/C 871-884, 888-899, 901-950 ) JOB SET-UP - BITE CK FAILED R/H EPSU BATTERY MESSAGE. REPLACED R/H EPSU PER AMM 33-51-38-400-001. NO HELP.ROTABLE PARTS CHG:TT # 1422751 SN OFF 4294 PN OFF 31-3350-9-900.IPC REFERENCE # DP STATUS UNREADABLE MISSING/UNREADABLE PLATE OPTION WAS SELECTED REPLACED EPSU BATTERY PER AMM 33-51-38-400-002-A OP CK GD.