Mini Cooper R56 P0137 code

No coolant in oil or problems with the coolant. From what I have read the froth in the oil cap is from air getting into the crankcase. The coolant level has not changed since it was flushed. The overheating was from the previous owner as indicated by the slighty melted plastic intake manifold.
I will do a compression test and crankcase pressure test tomorrow and post the results.