When to replace an oven for a tenant

[Gualtiero Piccinini]

A tenant just moved into a newly remodeled unit, for which I just spent a small fortune. This is a 2 bedrooms/1 bath for which the tenant is paying $750/month. The unit has a nice Whirlpool stainless steel oven with five burners and an oven. However, the tenant just discovered that the "up" button on the control panel doesn't work. Therefore, the oven can only be set at 350 degrees or less and the tenant cannot bake anything at more than 350 degrees. A technician who has looked into it says Whirlpool don't sell those control panels anymore so no repair is possible. Obviously, I want the tenant to be happy with her stove but I'm also bummed out about replacing an otherwise well functioning (and beautiful) stove. What should I tell the tenant?