ford 555b hydro leak from trans service panel

Just started a new job at a camp. It has a ford 555b backhoe that i need to repair. The issue is that the last mechanic changed the motor and there is a leak from the 4 bolt service panel under the trans. when i pulled the panel off there were bearing parts stuck to the back. when i look in i see a hydro fitting and the torque converter. Just looking for ideas on what it could be before i pull the motor. Thanks All

ford 555b hydro leak from trans service panel