if you have a spare TL072 and the one on the PCB is in a socket, go ahead and switch it out to check and satisfy your curiosity.
what you described could be lots of things, but a damaged IC from a loose wire would be pretty low on the list. take it out of the case and see if it works, then look for stray wires or cold solder joints. try to get it working out of the enclosure before you put it back in the enclosure. if it still doesn't work after you have given it a good exam, post some pictures of each side of the circuit board.