Pilot,
JLG built cat? yeah i've seen a few of these, just don't make the mistake of thinking you can just order JLG parts from their version of this machine, they don't always fit because of CAT's proprietary design in some cases.
But that's a whole different story we won't get into now.
As for that Product Bulletin from JLG?
i would highly recommend doing it.
JLG generally pays for most everything in these product updates so why not?
They may not cover hauling charges but that's nothing compared to the cost of the repair.
Look into it and you'll see ;o)