What was found
APU LOW OIL PRESSURE LIGHT LIGHT ON, APU HAD A PROTECTIVE SHUTDO WN APU AUTO SHUT DOWN TWICE IN CRUISE. FOUND APU LUBE FILTER INDICATOR EXTENDED. CHECKED MAGNETIC PLUGS, NO DEBRIS FOUND. REPLACED LUBE OIL FILTER AND INSPECTED THE REMOVED FILTER FOR DEBRIS, NO DEBRIS NOTED. APU OIL VISUALLY LOOKED VERY DIRTY/DARK. REPLACED APU OIL WITH NEW AS PRECAUTIONARY. APU BITE TEST SHOWED MAINT. MSG 49-91007 ( LOW SHOWED NO FAULTS ITEM 10Z. RAN APU WITH ALL INDICATIONS NOTED AND BITE TEST OIL PRESSURE). REPLACED OIL PRESSURE SWITCH REF. IPC 49-94-22-02