As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT 4430, AFTER PUSHBACK FROM THE GATE, AFTER APU SHUTDOWN, APU INTAKE DOOR FAILED TO CLOSE. RETURNED TO THE GATE AND MAINTENANCE PLACED ON MEL. COMPLIED WITH RIGGING CHECK OF THE DOOR IAW CRJ-700 AMM 49-14-19-820-801. CHECK PASSED NO DEFECTS NOTED. MEL CLEARED AND AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.