What was found
D: WHITE SMOKE IN ENTIRE AIRCRAFT AFTER PACKS TURNED ON AT THE GATEC: MEL 21-51-1FCAT C DUE 04/13/2023 (FLIGHT 3029 FILED CLOSED)APR 04, 2023 STATION: DFW--LEFT PACK IS DEFERRED PER CRJ 700 MEL 21-51-1F NO MAINT ACTION REQUIRED MCC NOTIFIED PLACARD INSTALLED APR 05, 2023 STATION: DFW -- R&R LH ACM IN REFERENCE TO APPLICABLE STEPS IN AMM 21-51-08OPS CHECK GOOD AT THIS TIME.PLACARDS REMOVED.DMI CLEARED.LEAK CHECK GOODAT THIS TIME.