What was found
(SUPPORT TASK) L-58 NO DOT; THE EMER LIGHT TEST FAILS WITH THE MESSAGE ''EPSU UNIT FWD L'' ATA 33-51-38. REMOVED AND FWD EPSU(10WL) AND FWD EPSU BATTERY IAW AMM 33- 51-38-000-002-A, 33-51-38-000-001-A, 33-51-38-400-001-A AND 33-5 1-38-400-002-A. OPS CHK GOOD IAW AMM 33-51-00-710-001-A. REMOVED AND REINSTALLED CEILING PANEL 221BC IAW A319 AMM 25-23-42- 000-001-A, AND 25-23-42-400-001-A IDT ROTABLE PARTS CHANGE WAS INDICATED - TT # 1249140 SN OFF 8099 POWER SUPPLY, C OFF 31-3350-9-9001 8099 ON 31-3350-9-9001 8228.