What was found
L & R PACK LIGHT, ON RECALL AFTER ENGINE START. GROUNDED - YES. PERFORMED FIM 21-53 TASK 821, FOUND L+R PZTC ZHOWING "THIS PACK TCV". PERFORMED FIM 21-62 TASK 830 + 831. BOTH TCV V139 + V141 SHOW 115AC. DUE TO RECENT HISTORY - REPLACED P5-17 PANEL. OPWEND /TAGEED 2 CBS. RMVD AN INSTALLED NEW P5-17. RMVD TAGS/CLOSED 2CBS. PERFORMED SYS TESTREF 21-61-07/401. WHILE DOING BITE 21-61 TASK 801. FOUND #1 PZTC FAULTING THIS PACK TCV. WOULD NOT CLEAR. REQUIRES REPLACEMENT V139 AND V141. REMOVED AND REPLACED BOTH LH AND RH TCV REF AMM 21-51-10. OPS GOOD LECK CHECK. BITE CHK GOOD REF AMM 21-61-00FAULT DID NOT RETURN.