As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB LT CSD OIL OUTLET TEMP.REACHED RED DANGER ZONE AND CONTINUED INCREASING. CSD WAS DISCONNECTED. APU WAS STARTED AT FL.260 BUT AT FL.305 APU HAD AUTO SHUT DOWN. DESCENT WAS DOWN TO FL.290 WE TRIED TO START APU AGAIN BUT START WAS UNSUCCESSFUL. CREW DESIDED TO RETURN TO BOG. CORRECTIVE ACTION: LT CSD WAS REPLACED IN ACC. WITH AAW.AMM.24-10-01 PAG.401.