The transmission had a leak, and was empty when I picked it up. And although they filled it for me, it only worked well for a while as it leaked out and became low

Once it was too low, it stopped working, and it was a challenge to troubleshoot it

The mechanic listened to it and confirmed it was a transmission issue, but when I called a local transmission expert, his estimate was $1,000 to rebuilt my transmission, and a week to do it. I kept looking for options

A friend recommended draining the fluid, and replacing the transmission filter, and gasket. Then refilling it

After doing that, it was able to drive again, and although there is still a small drip to track down, it seems to be working well