Was it used? Was any warranty given by place #1? If so, then they are obligated to fix or replace. But you will likely have to remove the trans and take it to them since that is how they sold it to you.

Was the leak from something place #2 did? Like did they change the filter, thus R&R the pan & gasket and now the gasket leaks?

Place #2 is only liable for the work they did.

If you paid #2 to fix the leak and it still leaks, then #2 would have to fix it again. Ifthe leak was fixed and returned later, how long did #2 warranty the repairs?

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5