What was found
MDIS 664 33-50 4218 17JAN22 LAX FACT U ON 'A' CHECK FOUND THE OPS CHECK OF THE EMERGENCY POWER SUPPLY FAILING. R/I 17JAN22 16:56 LAX U REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: 3214-41 POS: ONL SRL: 4332 TAG NBR: 61G103 ON MPN: 3214-41 CPN: 3310871 SRL: 4002 TAG NBR: 5425F4 REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: AD-3214-31 POS: 3 SRL: 237148 TAG NBR: 132H75 ON MPN: AD-3214-31 CPN: 3310373 SRL: 239910 TAG NBR: 5H1598 ACT 17JAN22 16:56 LAX U REF TSM 33-51-00 FIG. 106 REMOVED AND REPLACED EPSU AND BATTERY AS REQ'D REF AMM 33-51-14-04. OPS CHECK AND TEST OF THE EMERGENCY POWER SUPPLY CHECKS GOOD. OK FOR SERVICE.