As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INITIAL CLIMB, THE CREW NOTICED THE RT ENGINE OIL PRESSURE GUAGE HAD DROPPED TO ZERO PSI AND IT WAS NOT ASSOCIATED WITH A RT OIL PRESS ANNUNCIATOR. 20 SECONDS LATER THE CREW NOTICED A HARD BY-PASS AT ROUGHLY 630 DEGREES EGT. CREW INFORMED TOWER AND RETURNED BACK TO DEPARTURE WITHOUT INCIDENT. R & R THE RT ENGINE OIL PRESSURE TRANSDUCER IAW THE MM 79-30-01. GROUND RUN AND OPS CHECKS GOOD.