212 grader no oil pressure

Figured I would reach out to the experts for this one! 9T3633 serial ran great until one cold morning could not get it to build oil pressure. Waited for warmer weather drained oil, took apart oil filter/ manifold assy to see if there was blockages which there was none. Took side inspection plates on side of oil pan to see if there was a way to take oil pump/ suction bell out without having to pull engine off the rear axles. Now to the point does anyone have oil pump assy  P/N 2H7100 parts laying around? I have a feeling once I do remove engine that it’s going to be the culprit. Thanks all any advice appreciated!