As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT ENG OIL PRESS PEAKED HIGH AT CRUISE TO 70 PSI, THROTTLES MOVED BACK TO IDLE AND PRESSURE DOWN TO 45 PSI. OIL PRESS FOLLOWING THROTTLES, ALL OTHER INDICATIONS NORMAL. REMOVED AND REPLACED NR 1 ENG OIL PRESS RELIEF VALVE AND OIL PRESSURE TXMTR PER AMM. ALSO PERFORMED TEST C PER AMM, NO LEAKS NOTED. OK FOR SERVICE.