88 Buick vacuum & cruise help please.

Hi. 1988 Lesabre Custom 3.8, FWD with cruise. Dang cold out. Just got in. Might have missed a few things...but:
1) I found a loose vacuum line draped over the brake booster. Don't
know where it's supposed to originate but the other end IS attached to the side of what I believe is the CC regulator/diaphragm ass'y.
2)...and perhaps related...I discovered the vacuum reservoir on the firewall (that is what that is, right?)...it has two nipples at the bottom with vac lines attached. One disappears along the firewall under the adjacent black plastic cover (passenger side) and the other comes off and runs to the engine pretty much straight forward of where it is connected to the reservoir.
So, what of the "loose" CC vac line? And does the reservoir seem attached/hosed correctly? I know, I know, there's supposed to be a diagram under the hood or something, but I'm just now getting warmed up from being outside. Just curious if anyone knws of the top of their head. Thank you.
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