What was found
ON TAKEOFF BEGAN TO SMELL A STRANGE SMELL LIKE SOMETHING IN THE OVEN. THE SMELL DISSIPATED BUT F/A`S CALLED TO SAY SMELL WAS STRONG AND PASSENGERS WERE FEELING SICK. RETURN TO EWR DESCENDING THROUGH 3,000 SMELL GOT STRONGER REF L/P 4313598 AND REF AMM 21-00-01-100-801 C/W STEP E-18 OIL CONTAMINATION REMOVAL FROM AIR CONDITIONING AND PNEUMATIC SYS NO SMELL OR ODOR NOTED. SYS OPS CHECK GOOD. OK TO CONTINUE.