As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
**ATB** AFTER TAKEOFF MASTER WARNING GEAR NOT DOWN FOLLOWED BY GEAR DOOR. JACKED AIRCRAFT. RETRACTED LANDING GEAR.IMMEDIATELY HAD GEAR NOT DOWN WARNING. FOUND WARNING WOULD CEASE WITH #1 FSEU REMOVED FROM RACK.. REPLACE #1 FSEU PER MM 27-51-01-422-011. NO WARNINGS WITH GEAR UP AND THROTTLES ADVANCED. AFTER REPLACEMENT OF #1 FSEU ACCOMPLISHED GEAR RETRACTION. NO WARNINGS OCCURRED. REF. SSM 31-51-04.