If you have a problem with your Joy-Con on the Switch Lite and you live in Japan, getting things fixed up is going to be a bit more pricey than it is with the regular Switch. Nintendo will indeed fix Joy-Con issues for owners, which is priced at 2,160 per regular Joy-Con in Japan. When it comes to Joy-Con issues with the Switch Lite, the priced is set at 4,860 yen. That seems to be the price for just one Joy-Con, so that makes the endeavor twice as pricey.
If your Joy-Con is out of warranty in Japan and you experience issues such as non-responsive buttons or Joy-Con drift, Nintendo is able to fix these issues for 2160 yen (inclusive 8% sales tax). The fee applies to a single Joy-Con, so if both of your Joy-Con experience Joy-Con drift, you have to fork out 4320 yen.
As for the Nintendo Switch Lite, the repair fees for the same issues listed above is 4860 yen (inclusive 8% sales tax). That would mean to fix a single analog stick’s drift on the Nintendo Switch Lite, you have to pay more than double of that for the same issue on a single Joy-Con.