What was found
DURING WEEKLY CHECK FOUND L-2 AND R-2 DOOR OVERHEAD EMERGENCY LIGHTS INOP. / PRESS TO TEST OF EPSU FAULTED CONTROL UNIT. R&R'D EPSU (13WL) REF AMM-33-51-38-000-001-A, AMM-33-51-38-400-001-A EPSU TEST OK. WEEKLY CHECK TEST OF BATTERY SYSTEM STILL FAULTS EPSU INT LOAD AFT L. THE BATTERY INSTALLED WAS DETERMINED TO BE BFS SO REPLACED THE EPSU PER TSM 33-51-00-810-807-A, AMM 33-51-38-000-001-A AND AMM-33-51-38-400-001-A OPS CHECK GOOD BITE TEST GOOD."