I just started having a major leak from the black rubber plug in the front of the transmission where it bolts to engine. I have done research and can't find answer. There is no codes, the transmission fluid/filter changed 300 miles ago, new radiator/thermostate 300 miles also. It has tranny cooler on it. Am I destined for a rebuild or is there something I could try? I have been driving in town today short trips and no hard driving.