As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YHZ - FLT 4309 - CREW REPORTED SMOKE IN CABIN FROM APU. A/C RELEASED IAW MEL NR 49-00-00 CAT C PLACARD NR 211420. RETURNED TO SERVICE. AFTER ARRIVING EWR CO3982, MAINTENANCE REAN APU WITH BLEED AND PACKS ON AND AIRCRAFT CLOSED UP. NO SMOKE NOTED IN CABIN. CLEARED MEL AND RETURNED AIRCRAFT TO SERVICE. (M)