As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SAN - FLT 418 - EN ROUTE SAN-DFW, HEAVY SMOKE IN THE CABIN. DECLARED EMERGENCY AND RETURNED TO SAN WITHOUT INCIDENT. ACCOMPLISHED MAINTENANCE CHECK MANUAL CARD 21-96-01 AND FOUND NO DISCREPANCIES. ACCOMPLISHED PACK BURN OUT PER MM 21-20-02-2 AND REPLACED COALESCER BAGS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)