As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING GEAR WERE EXTENDED FOR LANDING, THERE WERE NO DOWN AND LOCKED LIGHTS AND THE F7 CIRCUIT BREAKER WAS POPPED. FOLLOWED THE QRH AND GOT THREE GREENS. THE CREW AND DISPATCH ELECTED TO RETURN TO MEM. REMOVED AND REPLACED LANDING GEAR CONTROL VALVE IAW AMM 32-31-15-04. P/N ON/OFF: HP848430-721, S/N ON: 2108, S/N OFF: 2080.