As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR HANDLE STOP BUMPER SHATTERED WHEN OPENING DOOR. REMOVED FROM SERVICE. INSTALLED NEW MCD HANDLE STOP BUMPER REF Q400 AMM 52-11-11-400-801 STEP 4.I AND MCN 6520839-01 ISS. 1. CLOSED DOOR A COUPLE OF TIMES WITH BUMPER REMAINING SECURE. AIRCRAFT RETURNED TO SERVICE.