As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C PACK 1 OVERHEAT MESSAGE ON EICAS WITH SMOKE. OPERATED PACK SYS 1 AND 2, NO SMOKE IN CABIN BUT PACK 1 OVERHEAT MESSAGE REAPPEARED ON EICAS. R & R NR 1 AIR CYCLE MACHINE IAW AMM 21-51-03, PERFORMED OPS CHECKS AND CLEARED THE MEL. THE ACFT WAS APPROVED FOR RETURN TO SERVICE.