As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EXPERIENCED LOW TRANSMISSION OIL PRESSURE. DURING RUN-UP AND LEAK CHECK FOUND TRANSMISSION OIL COOLER LINE P/N 900D3409526105 TO BE LEAKING FROM UNDER STEEL BRADE. REPLACED OIL COOLER LINE, OPS AND LEAK CHECK WERE GOOD. CUT BACK STEEL BRADE ON OLD LINE TO FURTHER INVESTIGATE CAUSE AND FOUND LINE TO BE CRACKED BELLOWS.