As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A STRONG BURNING ODOR COMING THROUGH THE A/C POSSIBLY THE RT PACK. RAN THE LT & RT PACKS FOR ONE HOUR THROUGH HOT AND COLD RANGE PER AMM 21-00-00-2, ACFT WAS GROUNDED. FOUND NO EVIDENCE OF ANY BURNING SMELLS. NOTE - JUST PRIOR TO TAKEOFF FROM CVG AIRCRAFT HAD BEEN DE-ICED.