Thanks for the help everyone. I've got an order ready to swap out all the WB series capacitors from Digi-Key. I was thinking of ordering one spare for each cap I'm looking to replace, where each cap's quantity is 1, 2, or 4, depending on specs. Is that sufficient? Is it overkill? I've been searching discussions here and can't find anything regarding expectations and best practices with electrolytic orders. I figured a spare one would cover me in case one tests bad or if I somehow screw up soldering, but I don't have any real experience to back that up.