As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE BEGAN TO CLIMB AFTER TAKEOFF. NORMAL BLEED CONFIGURATION, BOTH PACKS ON. AUTO, STANDBY OR MANUAL COULD NOT PRESSURE CABIN. FLIGHT RETURNED TO DEN. FOUND FORWARD CARGO DOOR SEAL AT LOWER END OBSTRUCTED BY THE CARGO NET AND FASTENER. SECURED NET AS REQUIRED AND PRESSURE CHECKED OKAY.