Agreed with everything said, get your maintainance people involved and avoid flying it or running it until then......
as for oil pressure
Low oil pressure in Lycoming or Continental aircraft engine
Inability to adjust oil pressure in Lycoming or Continental aircraft engine
some of them have a spring with washers behind it to increase the pressure. but as said
the cause may be indicitive of other problems so get your engineers to look at it or the overhaul company before it gets the wrong side of expensive.