Repairing an amp such as this is not that difficult. This amp had an issue with capacitors, that are easy to replace by the manufacturer or an authorized rep or a really good technician. It really isn't rocket science.
If you really liked the sound, keep the amp and repair it.
If you didn't like the sound, you still have to have it fixed before you sold it anyway. Unless you sell it as non working, which will result in you selling it for almost nothing.
Get it fixed and keep it. It really is a decent amp when the caps are replaced
Companies like Mark Levinson (not the original company) come out with "new" or upgraded products all the time which replaces the original stuff. This diminishes the resale value of the replaced/upgraded equipment greatly. Understand, upgrading equipment doesn't hurt the resale value much, because one can purchase it, send it in for an upgraded and be good to go. Example, Audio Research REF 5 can be factory upgraded to the REF5SE status.
Look. If you don't have money growing on trees in your yard like some people, then it will cost you much more to buy a new amp, at or better than this one.
You obviously liked the sound of this amp, so fix it.
enjoy