As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AN ACRID ODOR WAS NOTICED IN THE COCKPIT AND LATER IN THE CABIN AFTER DESCENT. STILL PRESENT WITH NR 1 PACK OFF. DISAPPEARED ON GROUND WITH BOTH PACKS OFF. THE AIRCRAFT WAS GROUNDED. REMOVED & REPLACED THE FAN MOTOR IAW AMM 21-26-51. OPS CHECKED GOOD.