As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS NOTICED A SIGNIFICANT SPIKE IN LEFT ENGINE OIL PRESSURE. OIL PRESSURE WOULD FLUCTUATE WELL PAST RED-LINE AND SPIKED AS HIGH AS MAX TRANSIENT OIL PRESSURE. A LOSE CONNECTOR WAS FOUND TO BE THE ISSUE. THE CONNECTOR WAS CLEANED, TIGHTENED, AND SAFETY WIRED. THIS CORRECTED THE PROBLEM.