13-inch MacBook Pro (non Touch Bar) Solid-State Drive Service Program

I don't think there is any expiration date on this at this time, but I'm not 100% sure, but I would definitely have Apple examine your laptop just to be safe. Apple has been making a fair number of mistakes in their documentation recently so it is hard to say for sure whether the public information is in error or the service provider information is wrong.

Make sure to have a good verified working backup before taking it or sending it to Apple for service as the SSD may be erased or even replaced during the procedure. The repair may only involve Apple upgrading the firmware on the SSD which will erase everything on the SSD, but if the firmware update doesn't work, then Apple will replace the SSD. Apple assumes the user has a backup.

This is one free repair program I wouldn't advise you to miss out on.

FYI, here is a list of all the current publicly acknowledged free repair programs for various Apple products (some products like your laptop have multiple programs):

https://support.apple.com/exchange_repair