As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED "SMOKE SMELL IN THE CABIN AND COCKPIT GOT BETTER ONCE PACK #1 TURNED OFF. MX INSPECTED AND FOUND #1 RECIRCULATION FAN MUFFLER BLOWN AND DAMAGED AND PARTIALLY DAMGAED MUFFLER ON RECIRCULATION FAN #2. REMOVED AND REPLACED BOTH MUFFLERS SYSTME OPS CHECKED GOOD. A/C WAS APPROVED FOR RETURN TO SERVICE.