What was found
PDIS 650 21-01 2289391 11FEB20 PHL CLOSE CREW NOTICED FUMES DURING TAKE OFF. THEN WENT AWAY. FUMES CAME BACK IN CRUISE FLIGHT AND GOT STRONGER TH ROUGH DESCENT FACT 11FEB20 18:43 PHL EVALUATION FLIGHT REQUIRED. RAN BOTH PACKS TOGETHER AND SEPERATELY ON FULL COLD AND FULL HOT IN AUTO AND MANUAL MODE. DID SAME SEQUENCE WITH APU BLEED AND ENGINE BLEED. RAN HYD PUMPS AS WELL TO SEE IF A SMELL COULD BE SMELT IN COCKPIT. ACFT WAS AT 90% N2 FOR AFEW MOMENTS AS WELL. NO SMELL EVER NOTED