The code P1700 just started coming up and it just started barely leaking coolant

p1700 is a generic code which basically means that the input on the gearbox has been measured and compared to what the output of the gearbox should be and it does'nt stack up.it does not mean replace the gearbox ecu,it is more likely to be any number of internal problems ie,solenoids,thrust washer,possibly low fluid level(worth a check)or even its just plain worn out.coolant leak is a separate issue.