What was found
(CAN) WHILE TROUBLESHOOTING A RT PROPELLER SHAFT LEAK MX FOUND 2 DRAIN HOSE LINES CLOGGED WITH OLD COKED OIL (LINES ARE LOCATED ADJACENT TO THE HOT SECTION OF THE ENGINE). ONE HOSE WAS ABLE TO BE CLEARED. HOSE P/N AE7013107G0180 (IPC REF CH 71-70-00 FIG 20 ITEM 40) COULD NOT BE CLEARED AND WAS REPLACED. MAINT ALSO NOTED THAT ON A FEW RECENT ENGINE CHANGES ON ACFT SIMILAR DRAIN HOSES (P/N DSC286A4-0173 AND DSC286A4-0180, IPC REF CH 71070-00 FIG 20 ITEMS 330 AND 340) WERE SIMILARLY FOUND CLOGGED BUT WERE ABLE TO BE CLEARED.