Near the end of this level is a minigame of sorts, which is how you actually fix the taps. You push the d-pad buttons and other buttons to time with as they appear in the circle on screen (kind of a DDR- type thing). Once you beat this head to the bottom level of the room and through the door. At the end of the passage here you find yourself back in the bar. talk to the barkeep again to finish things off.