What was found
(CAN) DIVERTED DUE TO DECREASING OIL QUANTITY NR 2 ENGINE. THIS ENGINE WAS CHANGED AND WAS ON ITS FIRST REVENUE FLIGHT. ALL LEAK CHECKS WERE COMPLIED WITH AS PER AMM 71-00-00 POWER PLAT REMOVAL AND INSTALLATION. INVESTIGATION REVEALED LOOSE "B" NUT ON LINE TO PRESSURE TRANSMITTER WHICH WAS TIGHTENED AND ENGINE OIL SERVICED. ENGINE RUNS AND LEAK CHECKS WERE ACCOMPLISHED AND THE AIRCRAFT WAS RETURNED TO SERVICE.