I just experienced the exact same situation a few weeks ago. Installed a pressure gauge, noticed low pressure. I got a few quotes from local shops that wanted $1800-$2500 depending on the shop just for the labor. I ended up doing the job myself. If you don't feel confident about tackling it on your own than definitely pay a professional for it, it's not a small job. I used the Z1 gasket kit that you mentioned.
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