What was found
THE AIRCRAFT N536LA FLYING MIA – BOG (L71817) DURING THE CRUISE PHASE (25 MINUTES AFTER TAKEOFF) IS PRESENTED RH GEN OFF AT EICAS; THE CREW APPLIED PROCEDURES (ATTEMPT ONLY ONE RESET PER FLIGHT) AND THE GENERATOR RECOVERS MOMENTARILY, BUT FAILS AGAIN. DUE TO THIS, ACCORDING TO THE QRH, THEY PROCEEDED TO TURN ON THE APU AND IT INDICATED APU FAULT, THEREFORE THE CREW MADE THE DECISION TO RETURN TO THE MIA BASE. UPON RETURNING AIRCRAFT N536LA TO THE MIA BASE, THE TECHNICAL STAFF ASSESSES THE FAILURE AND MAKES THE DECISION TO CHANGE THE IDG – INTEGRATED DRIVE GENERATOR RH (AMM 11-24-01); LIKEWISE, AN OIL SERVICE WAS PERFORMED ON THE APU (AMM 12-13-04) AND A GASKET (P/N AS3209-226-U1653) WAS CHANGED BECAUSE AN OIL LEAK WAS FOUND IN THIS COMPONENT. IT IS NECESSARY TO CLARIFY THAT THE APU HAD NO PREVIOUS REPORTS AND IT WAS FOUND TO BE OPERATING NORMALLY DURING THE AIRCRAFT'S TRANSIT IN MIA BEFORE THE FLIGHT WHERE THE OPERATIONAL EVENT (ATB) OCCURRED.