What was found
DISCREPANCY: REFERENCE LP1190574 ITEM #3 - THROUGH 12000FT HEARD LOUD NOISE COMING FROM FRONT OF AC SIMILAR TO FAN GRINDING. FOLLOWED BY ODOR, BURNING SMELL. CORRECTIVE ACTION - PERFORMED TSM 05-50-00-810-831-A TO IDENTIFY CAUSE OF VIBRATION AND ODOR. FOUND CAUSE TO BE EXTRACT FAN 18HQ. SEE LP1190575. LP1190575 ITEM#1 - REF LP1190574 ITEM#3 AVEC EXTRACT FAN REQUIRES REPLACING. CORRECTIVE ACTION - REMOVED AND REPLACED AVEC EXTRACT FAN (18HQ) PER AMM 21-26-51 PB401. OPS CHECK PER AMM TASK 21-26-51-710-001-A TESTED OK AC OK FOR SERVICE./END/