What was found
FUMES IN COCKPIT. BURNING ODER FROM FO OVERHEAD GASPER VENT. STARTED NEAR TOP OF CLIMB AND WAS INTERMITTENT. THEN THE SMELL BECAME STEADY AND CREW MADE THEIR DECISION TO DIVERT. CORRECTIVE ACTION: PERFORMED AIR CONDITIONING SYSTEM TEST IAW AMP BD500-A-J21-51-00-01AAA-320A-A , AIR CONDITIONING LEAK TEST IAW AMP BD500-A-J21-51-00-01AAA-364B-A, VISUAL INSPECTION WAS ALSO DONE TO RECIRCULATING FAN FILTERS IAW BD500-A-J21-22-03-01AAA-520A-A , DURING ALL OPERATION AND TEST NOT FUMES OR ANY DISTINCT SMELLS WERE PRESENT. (APU) DRAIN LINES -VISUAL EXAMINATION IAW BD500-A-J49-14-00-01AAA-311A-A OPS CHECK GOOD AND ALL PLACARDS REMOVED; NO FURTHER DEFECTS NOTED AT THIS TIME.