Where you can, remove the vents and risers, apply new sealant so that it is sandwiched between the roof and riser, and between the riser and vent. This was the only way I could fix my leaks.
I now use ProflexRV sealant. It can be applied in a neat bead, and you can apply over old ProflexRV. Unfortunately, you still have to remove old silicone.
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