As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT TOOK OFF FROM KCRQ TO KSLC, AFTER APPROXIMATELY HALF AN HOUR INTO THE FLIGHT AT FL390 & CRUISE, CREW NOTICED L/E OIL PRESSURE INDICATOR CONSISTENTLY FLUCTUATES BETWEEN RED & GREEN, BUT NO ANNUNCIATOR MASTER CAUTION FLASHED. CREW FOLLOWED QRH & WAS ABLE TO CONTINUE WITHOUT ANY FURTHER ISSUES.