What was found
UNABLE TO COOL COCKPIT BELOW 27C OR CABIN BELOW 25C IN AUTO OR MANUAL MODES DURING FLT. TEMPS GOT AS HIGH AS 32C IN COCKPIT & 28C IN CABIN. DETECTED MILD BURNING ODOR FROM COCKPIT WEMACS AFTER LANDING. THIS WAS ALL WITH ECS SET TO BOTH & APU OFF. NO SMOKE DETECTED. SWITCHED SELECTOR BACK TO LT/ BOTH & RT & SMELL WAS NO LONGER EVIDENT. DUE TO APU CAUSING "OIL" ODOR IN CABIN & FINDING THAT APU HAS BEEN USING EXCESSIVE OIL NCAW FROM AFT LOGBOOKS. CUSTOMER ELECTS TO MEL APU. DEFERRED IAW NJA MEL 49-1 CAT C DUE DATE 05/10/10.