As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD POP AND AIRFRAME SHUDDER AT OR NEAR LEVEL OFF AT FL 250 FT SAME THING WHEN GEAR WAS EXTENDED JUST PRIOR TO DOWNLOCK GREEN GEAR. THIS ISSUE HAS HAPPENED THE LAST 4 LEGS AT TOP OF CLIMB. FOUND AERODYNAMIC SEALANT MISSING FROM LT & RT BELLY FAIRINGS L/E CAUSING VIBRATION IN FLIGHT. CLEANED AND APPLIED AERODYNAMIC SEALANT IAW AMM 51-23-00.