What was found
FLIGHT RETURNED TO DEPARTURE STATION DUE TO SMOKE AND BRIEF FLAME COMING FROM ELECTRICAL PANEL BEHIND CAPTAIN'S SEAT. CREW COMPLIED WITH QRH AND LANDED SAFELY BACK AT BWI. MAINTENANCE FOUND THE ALTERNATE HYDRAULIC PUMP CONTROL RELAY HAD FAILED. REPLACED R2-15 RELAY AND ASSOCIATED TERMINALS, THE APPROPRIATE CIRCUIT BREAKER, AND SPLICED IN NEW WIRES 1H2756A16A, 1H2756A16B, 2H2756A16A, AND 2H2756A16B FROM S3715 TO COCKPIT (TO REMOVE BURNED WIRES FOR OVERWING HEATER SYSTEM).