Adjusting the RD trim, will help some of the skipping around in the rear, but not correct the chain dropping in the front.
It sounds like your dealer did a fairly poor job setting this bike up. You could look up various tutorials on the net for adjusting front and rear derailleurs. Or you could go back and ask the shop do the job right.
BTW- if the drive train adjustments are indicative of their overall work quality, I'd speak to the manager and ask that the entire bike be checked over.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
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Last edited by FBinNY; 07-03-11 at 08:45 AM.