I have done many, many refacing jobs. I think one of posts is correct, if the melamine panel is not scuff sanded the contact cement will not hold. This happens a lot, contact cement can fail over time. First some issue with some of the suggestions. CA glue and wood glue will be all or nothing. You will not have another shot if it does not work and if you get another bubble in the middle of the panel you have no way to remove the panel. I see a few options, easiest to hardest. First would be to use an iron or heat gun to reactivate the glue, and then clamp it for a few hours to see if it would hold. 2nd you can brush a thin layer of some waterbased contact cement in the bubble, squeeze the bubble to get out the excess, keep the bubble open to dry out and let sit overnight and then restick, apply pressure-a j-roller works best. Waterbased contact cement is easy to work with, clean up is easy. It will rub off of almost any finished surface. Third use regular yellow or white glue "cold press". We used to use contact cement to glue veneer/laminate to melamine panels, then switched to regular glue and clamped them over night and they held for years. If you wanted to remove whole veener panel because it was loose or more bubbled and they used contact cement, that is fairly easy as well. I have done this 100s of times. You open the crack and start pouring in laquer thinner( we used liquid dish washing bottles) keep pouring and the the panel will come right off. Then if after you sand scuff the panel you could cold press the panel with wood glue or use contact cement. I would try the heat first then contact cement, because you basically will do no harm. Cold press or CA glue will one shot. If the panel has another bubble, not on the edge you will be screwed.