As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL PSI FLUCTUATION 5+= MOVED INTO THE YELLOW ARC ON THE HIGH SIDE. DIVERTED. REMOVED FROM SERVICE. REF Q400 AMM 71-00-00-780-801 ADJUSTED OIL PRESSURE ADJUSTER APPROX ONE QUARTER TURN COUNTER CLOCKWISE ON #2 ENG. RUNS AND LEAK CHECK GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.