As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4038 - SMOKE DETECTED IN CABIN DURING TAXI. AIRCRAFT SAFELY RETURNED TO THE GATE. MAINTENANCE PERFORMED GROUND OPERATIONAL CHECK AND DETERMINED THE PROBLEM TO BE THE RIGHT PACK. MAINTENANCE REPLACED THE RIGHT PACK AND GROUND COOLING FAN. FURTHER INSPECTION SHOWED THE FEEDER PROTECTION RELAY MOUNT BURNED. (M)