As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 2928 PHL-DCA. DEPARTING PHL THE CAPTAIN REPORTED THE RIGHT MAIN LANDING GEAR WOULD NOT RETRACT AND A GEAR UNSAFE CONDITION EXISTED. THE GEAR WAS PLACED BACK DOWN AND ABNORMAL SAFE LANDING WAS EXECUTED. MX FOUND THE RT MLG PROXIMITY SENSOR TARGET NOT SECURE. THE TARGET WAS SECURED, GEAR SWING PERFORMED AND AIRCRAFT RETURNED TO SERVICE. NO PARTS USED.