After three days of rain, I found that leaks in the bow from the pulpit screws. The bilge was at the same level after they pumped. I think, originally water came from the life line stay and the cockpit drain hole.
I put white napkins under transmission and engine. In result, only one oil drop in two days after the sea trial and idle run. I assume, the oil in the bilge can be from the old engine. They changed it in 2013 and maybe didn’t clean the deep bilge.
Next weekend I will check the bottom. Thank you!