[Phlogiston]

I might play with re-forming, just for the learning as I've never tried it. As for the amp, the new caps are paid for and very nice quality, no doubt they will see good service.

Don't waste your time. The results are usually very short term. Even then ESR is likely to go up. The problem is usually being the electrolyte has become un-evenly distributed and this causes the oxide layer to also be uneven IF you can get it to reform.

We used to turn them upside down before reforming - actually makes sense - also a waste of time.

After you have a "bad" cap removed, don't invest the time putting it back.