What was found
PDIS 648 21-01 2768031 18NOV22 ROA CLOSE DURING TAXI AND TAKEOFF INTERMITTENT "TAR" SMELL NOTED IN COCKPIT. AFTER TAKE OFF PACK 1 VALVE OVERHEAT DISPLAYED. 29919 00 MDC FACT 18NOV22 01:12 ROA T/S PER FIM TASK 21-51-00-810-803-A. FOUND TO BE TRANSITORY, INSPECTED COUPLINGS AND PIPES FOR DAMAGE ON PAC1. NO DAMAGE NOTED AT THIS TIME, RAN BOTH PACKS FULL HOT AND FULL COLD FOR SEVERAL MINUTES, NO DEFECTS NOTED. NO "TAR" SMELL NOTED OK FOR SERVICE.