I am a little confused about "warranty". It is 95 and suppose to be out of warranty, unless you bought it with some other company.
Now back to your code. I think any garage can check your codes but I doubt they will do it for free.
You can do it yourself.
Remove your glove box. You will see a blue connector with two wires. I think this connector is pluged somewhere on the wall. Pull it up. You need to short this connector with something (paper clip comes handy here). Then put your key in the ignition and turn it to ON (ENGINE NOT RUNNING). Count short and long blinks on the MIL. That will be your code.
If you want more details about this procedure you need to get Haynes repair manual. The procedure is there. If you do not want to buy a book, look for it in the library.
Good luck,
Sam