As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE ALARM IN CABIN SOUNDED ON GROUND. FUNNY ODOR IN COCKPIT BEGAN TO DISIPATE WHEN ALT PACK TURNED OFF. MX SOUND EVIDENCE OF GLYCOL IN AND AROUND THE PACK AND COOLING FAN AREA. MX CLEANED THE AFFECTED AREA AND RAN THE PACKS FOR OVER 30 MINUTES WITH DEFECTES NOTED. REFERENCE MM 21-50-00.