It's hard to second guess someone who actually had the bike in his hands. I'd need much more specific info.
But I do have a question. You say the right lever has a problem, yet you describe shifting the front. Front derailleurs are usually wired to the left shifter, so is your problem with the right/rear, or left/front?
__________________
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
WARNING, I'm from New York. Thin skinned people should maintain safe distance.