Hi again, helping a friend get his w107 280sl (M110) 1975 back on the road. We want to get the transmission leak fixed as its getting bigger

so started working on it trying to find a leak cleaned it up and found drops of ATF fluid from the grate where the torque converter is.
Q1. Could the plug be the cause and need a new washer?

or is there another place here where it could leak from? It seems to leak the most when starting from cold then slows but will continue to leak.
I guess this is possible but it is what I call wish full thinking. This is most likely a transmission front seal and requires removal of the transmission
Q2. Also when measuring the AT fluid when hot what should the reading be? When we did this it is well below the bottom line on the dip stick and when cold all the way up well past the top line??
This is AFU. Wait a half hour then check it again.
Any tips would be fantastic
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W107 280sl (M110) 1975