sandy writes:

Is there some way to patch this?

It's tedious and tricky, but I have successfully removed solvent "welded"
PVC fittings several times by sawing carefully along and through the
fitting and then prying and chipping it off. The "welded" junction is
typically weaker than the bulk material, making this possible. In some
situations this is better than replumbing back to a "good" spot.