As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT WITH POWER BACK, RECEIVED A VERY HEAVY BURNING ODOR. ODOR DISSIPATED SOME BUT WAS STILL NOTICEABLE ALL THE WAY TO DIVERSION AIRPORT. NO SMOKE OBSERVED. PAX REPORTED HOT AIR COMING FROM LT SIDE CABIN VENTS & COLD AIR FROM RT SIDE CABIN VENTS. R & R THE CABIN ACM. PERFORMED OPS TEST, OPS NORMAL IAW MM 21-51-00. R & R CABIN WATER SEPARATOR COALESCE IAW MM 21-51-00. PERFORMED ECS DUCT BURN OUT OPS TEST. FOUND SATISFACTORY IAW FORM TC-750-21-120801M R1.