As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT A 100 HR INSPECTION ON HELICOPTER, INSTALLED A NEW OIL COOLER REPLACING THE ORIGINAL OIL COOLER. (NOVEMBER 5, 2007, HOUR METER 1042) WHILE FLYING, NOTICED THE OIL TEMPERATURE RISING AND THE OIL PRESSURE DROPPING. MADE AN UNSCHECULED LANDING AND DISCOVERED THE TAILBOOM COVER WITH ENGINE OIL. TRACED THE OIL BACK TO THE OIL COOLER, REMOVED OIL COOLER AND PRESSURE TESTED IT AND FOUND A .7500 INCH CRACK IN THE COOLER CORE. (TT 16.8 HOURS) (K)