Almost any pressure sensitive tape can be removed with the gentle
application of heat.  This softens the adhesive and allows for removal
without destroying the paper.  Unfortunately this is a very slow process.
The heat must be applied very slowly and to a small area at a time to
avoid warping or weakening the paper.  I use a tiny heat gun that was
made for shrinking heat-shrink tubing in close quarters.  It has a nozzle
about 3/16" in diameter and puffs out hot air.

As soon as the tape is warm enough to soften the adhesive, begin lifting
the tape and advancing the heat to a new area.  Residual adhesive will be
minimal if the heat is just right.  If the old repair is holding and not
shrinking and warping the paper, I would tend to leave it and hope that
it will fall off on its own eventually.  The tape might weaken the paper
but so will removing it.

Spencer Chase