What was found
PILOT REPORTED A PACK 2 OVERHEAT AND PACK 2 VALVE FAIL MESSAGE ON EICAS. PACK 2 OVERHEAT QRH SAID TO SHUTOFF PACK FOR 3 MINUTES. DURING 3 MINUTE PACK SHUTDOWN, SMOKE ENTERED COCKPIT FROM DV WINDOW VENTS. CABIN SMOKE IAC & QRH COMPLIED WITH. WHEN RECIRCULATING FAN TURNED OFF, SMOKE CLEARED. RESET PACK 2. ACFT LANDED WITHOUT INCIDENT. AFTER LANDING, PACK 1 OVERHEAT ON EICAS ONLY HOT AIR WAS DISTRIBUTED. MAINTENANCE PERFORMED OPS CHECK OF PACK 2, NO FAULTS FOUND AND NR 1 ACM PLACED ON MEL. MAINTENANCE R & R NR 1 ACM WITH OPS CHECK GOOD. ACFT WAS APPROVED FOR RETURN TO SERVICE.