What was found
AIRCRAFT NOT GROUNDED. WHILE PERFORMING TC 335100-03-1-001, PERFORMED OPS CHECK OF THE EPSU IAW AMM 33-51-38-865-058-A, OPS CHECK FAILED, FOUND EPSU UNIT (13WL) IN A FAILED STATUS. REMOVED AND REPLACED THE BATTERY(13WL) OF THE EPSU IAW AMM 33-51-38-000-002-A AND AMM 33-51-38-400-002-A, OPS CHECK FAILED, T/S IAW TSM 25-62-00-810-819-A. R & R AFT LEFT SLIDE (7502MM) IAW AMM 25-62-44-000-012-A, 25-62-44-007-A. BITE CHECKED GOOD.