What was found
SMOKE IN THE CABIN. TURN OFF BOTH PACKS SEEMED TO STOP THE SMOKEY CONDITIONS (FLIGHT 6374) PERFORMED TROUBLESHOOTING OF SMOKE IN CABIN IAW FIM 21-22-00, TROUBLESHOOTING & TALKING WITH FLT CREW, FLT CREW REPORTED SMOKE IN CABIN SOON AFTER PACKS WHERE TURNED ON & OPS FOR A SHORT PERIOD. FURTHER INVESTIGATION WITH OPS TESTS OF PACKS NR 1 & 2 IAW AMM 21-51-00, IT HAS BEEN DISCOVERED THAT PACK NR 1 HAD FAILED, NOT ONLY DOES PACK NR 1 PRODUCE SMOKE BUT PACK NR 1 TEMP READINGS SPIKED TO 99 DEG C DURING MOMENTARY OPS. PERFORMED ENGINE RUNS IAW AMM 71-00-00, DURING ENGINE OPS CONTINUED TO OPERATE PACK NR 2 WITH NO ISSUES & SMOKE HAD CLEARED CABIN, SEE AML 1669229 FOR FURTHER MX ACTIONS PERFORMED, ACFT OK FOR SERVICE.