I have actually fixed these things in Sonar. Frank Coffey's sugestion is the best route. (Use an editor that allows you to redraw the wav form with a pencil tool).
But in a pinch I have done the following procedure:
1) grab a single sample that is above zero just in case.
2) grab a single sample that is below zero just in case.
3) Zoom in on the pop and determine how many samples are involved.
4) Select single samples and increase or decrease by 3 db as required to reshape the pop.
5) When necessarry replace a positve sample with a negative sample or vice versa and increase or decrease by 3 db until you have successfully redrawn your entire pop.
I have completely repaired a single pop a couple of times this way so that the results were indetectable.