OVMS TR1N,29,0 error while car is in shop...

I wouldn't worry too much about it. Some error messages are translated and others aren't. I've noticed that opening the drivers door with th key in throws an error that's readable, while opening the passenger door throws an error that reads like the one you posted.

Recently, I added some more known error codes to the OVMS error code translation table for the Roadster. I guess whenever the OVMS server will be updated, a lot of the codes will be translated into something readable.