What the heck did they do? I can't say how much a dealer would charge as I do the work myself. I know what the parts/supplies cost and the amount of time I spend.
100 hrs service should consist of (per drive/engine):
1. Gear Lube change. $25 gear lube and at best 1 hrs labor.
2. New fuel/water separating filter. $10 for the filter and a best .25 hrs labor
3. Oil/Filter change. $30 in oil plus $7 for the filter and .75 hrs labor.
4. New raw water impeller. $45 for the impeller and .75 hrs labor to change.
5. An alignment check (maybe). If they do it, figure at most it should be $150.
During the alignment check they should inspect the gimbal bearing, universals and the bellows for any leaks, cracks, etc. Several of the jobs can be done in tandem. I change out he fuel filters as the oil is being sucked from the engine and also draining the gear lube into a pan.
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Jvalich
http://www.badcock.com'04 FW 288 Vista "Mental Floss"