What was found
ON TAKE-OFF REC'D RT ENG OIL WARNING MESSAGE. MESSAGE WAS INTERMITTENT. OIL PSI FLUCTUATED BETWEEN 25 AND 35 PSI. OIL TEMP WAS NORMAL. MESSAGE WAS LESS INTERMITTENT WITH REDUCED POWER. EVENT DESCRIPTION: EN ROUTE, THE #2 ENGINE OIL PRESSURE BEGAN TO FLUCTUATE. AFTER REVIEWING THE QRH AND COORDINATING WITH DISPATCH, THE FLIGHT CREW HAS DECLARED AN EMERGENCY ***AIRCRAFT REMOVED FROM SERVICE*** REMOVED AND REPLACED THE OIL PRESURE TRANDSUCER O-RING AND INSTALLED MISSING TEFLON BACKER RINGS ON RIGHT ENGINE. IAW AMM 79-31-05, OPS CHECK AND LEAK CHECKS