As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DECENT PASSING THROUGH 12000 FT AIRCREW NOTICED ACRID MUSTY FUMES IN COCKPIT. FUMES IN THE CABIN. IMMEDIATELY TURNED OFF NR 2 PACK TO TRY AND ISSOLATE FUMES, DECENDED THRU 10000 FT. FUMES DISSAPATED, LEFT PACK OFF FOR REMAINDER OF FLIGHT. PERFORMED TAXI AND IDLE ENGINE RUN WIRH LT PACK ACTIVATED ONLY. NO FUMES OR ACRID ODORS NOTED ANYWHERE IN AIRCRAFT. AIRCRAFT OILS WITHIN LIMITS, NO LEAKS NOTED.