What was found
(CAN) DURING GROUND RUN OPERATIONS, FOLLOWING SCHEDULED INSPECTION, AIRFRAME/ENGINE. ENGINE OIL PRESSURE INDICATION SLOW AND/OR ERRATIC RESPONSE AT INITIAL START UP. IT HAS BEEN DETERMINED THAT THE ELECTRICAL COMPONENTS OF THE OIL PRESSURE INDICATING SYS ARE NOT AT FAULT. THE B283-1, HOSE ASSEMBLY FROM THE ENGINE CASE TO THE OIL PRESSURE SWITCH REQUIRES REMOVAL AND OLD OIL TO BE CLEARED FROM THE HOSE. ENGINE OIL PRESSURE SYS OPERATES NORMALLY AFTER HOSE FLUSHING.