As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AND ENROUTE #2 OIL PRESSURE INDICATED 72 (YELLOW) FOR A COUPLE SECONDS AND THEN DROPPED TO 70. THIS OCCURRED SEVERAL TIME A MINUTE. EVENT MARKER PRESSED ONCE. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. ADJUSTED #2 ENGINE OIL PRESSURE IAW Q400 AMM TASK 71-00-00-780-801, NO LEAKS NOTED. NOTE: ADJUSTER WAS TURNED 1/2 TURN COUNTER CLOCKWISE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.