What was found
REPEAT WRITE UP. DURING FLT AT CRUISE, THERE IS A BURNING OIL ODOR IN THE CABIN. CABIN WILL NOT COOL DOWN CABIN REMAINED OVER 90 DEGREES WITH ACFT RUNNING ON MAX COOL FOR OVER AN HOUR ALL THE WAY INTO THE FLT LEVELS. COMPLIED WITH OPS REQUIREMENTS OF THE MEL. COCKPIT & CABIN TEMP CONTROL SYSTEMS ARE CONSIDERED INOPERATIVE. CABIN PRESSURIZATION IS CONSIDERED INOP. REMOVED APU ASSY IAW HNYWL RECOMMENDATION & INSTALLED CUSTOMER SUPPLIED REPAIRED APU SERVICED APU, PERFORMED APU HRS UPDATE, & PERFORMED GOOD LEAK & OPS CHECK OF APU. WORK PERFORMED IAW AMM 49-10-00, 49-00-10, & 12-40-39 (NEW APU HOURS (GTC) 2388.2 APU CYCLES 4508).