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Dead Pickup, Live Pickup?

Tomorrow I will be embarking on a tour to Puerto Rico with my school band and I was planning on taking a crappy Yamaha bass I own. I obviously didn't want to take my nice DJ Lakland :), so I thought this would be a good choice. But, I pulled the bass out tonight, only to find the J-Bridge pup has a BAD crackling tendency. I switched the volume controls on the P-Neck pup and the J-Bridge Pup to see which of the two was causing this hideous noise, and it turned out to be the J pup. Is there anything I can do to fix this before 7 AM tomorrow when my plane leaves?!?!?

Thanks!
~Ryan
 
well, I just pulled out the pup, and saw no loose connections. I looked at the pup and it had one wire that looked pretty comfortably attached to the pup. I couldn't really see much of anything after taking out the pup, there's just some semi-sponge like material on the bottom of the pup....couldn't pull the spongy material off either.
 
The J pup has only one wire running to the appropriate pot, and it maintains a solid connection to the pot. Ya think the pot could be dirty? I seen a pot cleaned before by spraying some sort of spray into that hole on the pot, but if I should try and clean it, what should I use? Any specific brands? WD-40?
 
A quick note on compressed air cans (keyboard dusters), do NOT spray them into your pots or any other electronics while the can is tilted a lot or held upside down. This is common knowledge around most people I know, but I thought I might add it here anyways. Also, don't directly inhale the white fumes that come out of the can when tipped upside down. :)