How to repair broken calculators?

"What's seems to be the problem with it? Ifixit does not do repairs. They just give advice on how YOU can repair it and there are several guides on this model. We might be able to locate a specialist by Googling it. Also consider that this is an 18 year old product,

A new one can be had on eBay for $42.

https://www.ebay.com/p/?iid=162422077534..."