As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHT AIRFRAME VIBRATION DURING CLIMB THROUGH FL250 AT 302KTS. VIBRATION GONE SLOWING TO 290 KTS. FOLLOW MT 53-005 FOR VIBRATION TROUBLESHOOTING. CHECKED NLG DOORS NO DEFECTS NOTED REF AMM. FOUND ELECTRICAL RECEPTACLE DOOR LOOSE ADJUSTED DOOR REF AMM 52-42-12-400-001-A.