As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE FORWARD ACCESSORY COMPARTMENT DOOR LIGHT ILLUMINATED AND AIRCRAFT WOULD NOT PRESSURIZE. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. FOUND FORWARD ACCESSORY COMPARTMENT DOOR OPEN. SECURED DOOR. OPERATIONAL CHECK GOOD.