What was found
STRONG BURNING SMELL (LIKE BURNT RUBBER) AFTER WE ADVANCED THROTTLES AND TOOK OFF FROM TWF. ALL INDICATIONS WERE NORMAL. FLIGHT 4234-FILED CLOSED. THIS DISCREPANCY WAS TRANSFERRED TO CAMP ITEM 21955715 WITH THE FOLLOWING CORRECTIVE ACTION: "FIM TASK COMPLETED SEE CP 21958284 FOR DETAILS, REPLACED RT ACM SEE CP 21958299 FOR DETAILS. RAN BOTH PACKS FOR AROUND 45 MINS AFTER ACM REPLACEMENT NO FUTHER NOTES OF ODD SMELLS IN THE CABIN. OPERATIONS CHECKS GOOD IAW AMM.