What was found
DISCREPANCY: REFERENCE LP1170958 ITEM#1 - ON DECENT F/A'S NOTICED STRONG ACRID ODOR WAS ALSO NOTICED IN THE COCKPIT. CORRECTIVE ACTION - REF TDI CNTRL# 1150146 FOR PRIOR FUME EVENT. PER ES# AO21T - 34386 C/W TROUBLESHOOTING IAW TSM 05-50-00-810-831-A. CAPTAIN OPERATED ENGINES FOR TROUBLESHOOTING PER TSM 71-00-00-810-802. BOTH ENGINES AND PACKS OPERATED WITH NO ODORS NOTED AND VERIFIED BY CREW. 2ND EVENT OF TDI CNTRL# TDI DUE DATE REMAINS THE SAME. FINAL CORRECTIVE ACTION - LP1170958 ITEM 3 - REF MDDR 1150143 R&R APU REF AMM 49-11-11PB401 OPS CHECK GOOD NO OTHER DEFECTS NOTED AT THIS TIME. T/W USED F9TAB5836 CAL 6/19 MEL REMOVED./END/