What was found
STT FLT 1041 EN ROUTE STT TO CLT. DURING CLIMBOUT FROM STT, AT APPROXIMATELY 800 FEET, THE CAPTAIN'S COCKPIT INSTRUMENTS WENT BLANK. THE CREW PERFORMED A CROSS TIE RESET, AND GOT THE INSTRUMENTS MOMENTARILY OPERATING AGAIN, THEN FAILED ONCE MORE. AN EQUIPMENT OVERHEAT LIGHT AND A LEFT ENGINE GENERATOR LIGHT CAME ON, FOLLOWED BY AN ELECTRICAL ODOR IN THE COCKPIT. THE FLIGHT CREW GOT THE APU RUNNING, BUT DECIDED TO RETURN TO STT. NO EMERGENCY WAS DECLARED, AND THE CABIN WAS NOT PREPPED FOR AN EMERGENCY. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PLACED THE AIRCRAFT ON MEL AND PERFORMED AN OVERWEIGHT LANDING INSPECTION. OK FOR SERVICE. LATER, THE PROBLEM WAS TROUBLESHOT TO A GENERATOR CONTROL UNIT (GCU). THE GCU WAS REPLACED. OPERATIONALLY CHECKS OK.