Anything that disturbes the miserable little rubber tubes will start leaks after they harden up. The hardening process can be in one year or I've seen 25-years go by. After they are hard little really can be done except to replace them. It's not a difficult job, and is one that you can do most of the dirty work with your mechanic looking on to supervise the valve train.
This is a good time depending on time since last cylinder removal to check push rod clearance while bled down, cam lift and for cracks in the rocker arm webs. there is an A-D on them for this. The boots are not expensive, but do buy them from a high turnover shop not from old stock or your problem will more quickly return. I personally warm them to about 130 or so and lube them with DC-4 before putting them on. You can get the proper tool that helps at "sears" among others. Good luck this should take only minutes to accomplish after all the other stuff is removed. If it's the other end (the top) then you need to have the tube "swedged" carefully with the proper tool./tom
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