As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED NO BETA INDICATION WHEN ON LANDING ROLL AND TAXI. BETA SWITCH AND PLUMBING CHECKED. OIL LEAK WAS EVIDENT ON ENGINE COWL FLAP. SOURCE OF OIL LEAK DETERMINED TO BE FROM BETA SWITCH VENT HOLES. 0.5 LITERS OF OIL WAS LOST IN THIS MISHAP.