Sachs Saxonette 47cc - Coleman 2.4 mini bike transmission fluid check?

#1
Does anyone know where I can find some info on where the transmission fluid goes or how to check/replace it? I found a 60s-70s model (I think) Coleman 2.4 mini bike with the Sachs Saxonette 47cc 2 speed automatic in my grandmothers garage and got it running again but I'm having a few problems...

When riding it, it will shift into 2nd gear just fine but it isn't shifting back into first when I slow down to make a turn and the engine stalls and dies. It then doesn't want to start back up seemingly because it's still in 2nd gear. I can roll it backwards and forwards a few times to finally get it to start again.

FYI, I'm not very engine savvy so please feel free to scold me.
 
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