As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF FROM DCA. CHECKLIST PROCEDURES WERE COMPLIED WITH AND THE AIRCRAFT WAS RETURNED TO DCA WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE GROUND SPOILER INTERLOCK VALVE CABLE BROKEN. THE CABLE WAS REPLACED IAW MM 27-62-51. OPERATIONAL CHECKS WERE GOOD.