As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KSLC/KDAY - FLT 211 - AFTER TAKEOFF FROM KSLC, CARGO COMPARTMENT FILLED WITH SMOKE. AIRCRAFT RETURNED TO KSLC. MAINTENANCE FOUND THE RT PACK OVERHEATED. MAINTENANCE TRANSFERRED THE RT PACK TO THE DMI LIST IAW MEL 21-38. SUPPLEMENTAL DATA TO FOLLOW.