What was found
LANDING GEAR HANDLE COULD NOT BE MOVED FROM DOWN POSITION FOLLOWING TAKEOFF. RAN QRH, RETURNED TO FIELD. NO EICAS MESSAGES. DECLARED EMERGENCY, RETURNED TO FIELD, LANDED WITHOUT INCIDENT. R&R DC POWER MODULE SPDA 1 SLOT 13 IAW AMM 24-61-13 AND PERFORMED OPS CHECK OF LANDING GEAR LEVER/RELEASE SWITCH IAW ETD2019-170-028950.