As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, RECEIVED NUMEROUS LT ENGINE OIL WARNING MESSAGES ALONG WITH A FLUCTUATION OF LT LOW OIL PRESSURE INDICATIONS. OIL PRESSURE NEVER DROPPED BELOW 5 PSI. DECLARED AN EMERGENCY. COMPLIED WITH QRH & RETURNED TO DEPARTURE. R & R OIL PRESSURE TRANSDUCER IAW 79-31-05. R & R LOW OIL PRESSURE SWITCH AMM 71-31-03. OPS CHECKED GOOD IAW AMM 80-10-00.