What was found
MCI - FLIGHT 3088, DURING TAXI THE CREW REPORTED SMOKE IN THE CABIN DURING PACK 2 OPERATION, THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE INSPECTED THE AIRCRAFT, PERFORMED E1 & E2 RUNS AND BLEED & PACK SYSTEM CHECKS ALL WITH NO DEFECTS OR SMOKE NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.