As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANT REPORTED SEEING LIGHT SMOKE IN AFT CABIN PRIOR TO PUSH. CREW DEPLANED AIRCRAFT FOR INSPECTION. CREW DID NOT NEED MASKS, NO FIRE SUPPRESSION SYSTEMS USED. NO PASSENGER COMPLAINTS OR INJURIES FROM INHALATION. NO EMERGENCY DECLARED. RH PACK BLOWING SMOKE IN CABIN / DEFERRED RH PACK PER MEL 21-51-1-2 CAT C. / REMOVED AND REPLACED RH PACK ACM IAW CRJ 700 AMM 21-51-08-000/400-801.