200k miles Is250 (no prev trans records bought at 130k)was leaking fluid , so i took it in about 2 weeks ago to a highly reviewed local transmission shop in the area where they did a drain/fill and replaced gasket and filter. Before I took it in, there were no symptoms indicating transmission failure and the car shifted smooth after they serviced it.


That is up until 2 days ago where I noticed the tc shudder in 4th . So i brought it back and had them go over fluid levels and inspect if they made an error and they notified me that everything checked out. They also stated they were able to replicate this issue while test driving and concluded that the torque convertor is on its way out and they would add a tube of shudder fix to temporarily alleviate.

So my question is what if they did something wrong ? Should I take the car to Lexus tomorrow and have them inspect and pay additionally for them to drain and fill ? I have another vehicle but I like always having a backup .