just wondering if there's a place where I can download a service manual for a 94 FWB?

I don't think so. You have a few options:

1. Purchase the manual in print from helminc.com
2. Check ebay for a cheaper one
3. Join alldata. If you are looking for online, this is your best bet.

You're not going to find a free option (if that is what you are looking for)...

I found a 94 RWD Cadillac FSM (http://cgi.ebay.com/ebaymotors/1994-Cadillac-Fleetwood-Service-Repair-Manual_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1071Q7c39Q 3a1Q7c66Q3a2Q7c65Q3a12Q7c240Q3a1318QQ_trksidZp3286 Q2ec0Q2em14QQhashZitem260277771145QQitemZ260277771 145) for you on ebay. Ten bucks!

I looked for CD ROMs for you, too, but it looks like they are only available for 72 and earlier.

Just buy a book off of ebay. I bought one for my 1991 Brougham for $15.