As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AMBER SERVICE DOOR EICAS MESSAGE CAME ON THOUGH 10,000 FT. FOLLOWED QRH, THEN RETURNED TO SLC AIRPORT. CAUTION INDICATION REMAINED ILLUMINATED. PSEU SHOWED S38 FOR FORWARD SERVICE DOOR INNER HANDLE SCREWS LOOSE. TIGHTENED SCREWS AS REQUIRED. OPS CHECK GOOD.