As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING MSP AND CLIMBING THROUGH 5,000 FT AMBER MASTER CAUTION LIGHT BEGAN TO FLASH AND LOOK UP LIGHT CHIME BEGAN TO SOUND WITH EACH FLASH AT APPROX 17,000 FT. CABIN DOOR NOT SHUT BEGAN TO FLASH. AIR RETURN TO MSP. FOUND FWD PAX DOOR CABLE LOOM BRACKET BROKEN CAUSING CABLE TO GET PINCHED IN DOOR FRAME. REPLACED BRACKET, P/N HC923H1193-000. ALL CHECKS GOOD.