As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PACK 1 TURNED ON BURNING ODOR AND SMOKE IN COCKPIT. NO SMOKE PRESENT AT MAINTENANCE ARRIVAL. TROUBLESHOT ODOR EVENT IAW FIM 21-20-00-810-801-A, FOUND PACK 1 ACM INTERMITTENT SEIZING DEFERRED IAW MEL 21-30. REMOVED AND REPLACED AIR CYCLE MACHINE IAW AMM 21-51-03. OPC GOOD AT THIS TIME. NO LEAKS FOUND. MEL RESTORED.