Clean the transmission and find where it’s leaking. The usual suspects on the passenger side are the secondary pump and B2 piston cover. There’s also the dipstick tube and Bowden cable but they don’t see the pressure to leak at the rate you describe. Maybe the cooler return line?

Peter Schmid isn’t the shop it was 20 years ago. I believe it’s changed owners. It used to be the preeminent shop but it has its share of unhappy customers these days. Sun Valley in Pacoima (SoCal) gets far more praise on this forum.

Sixto
98 E320s sedan and wagon
02 C320 wagon