There's sense coming from both sides of this arguement. On one hand, the whole point behind an umpire being on the field is to make the call right. On the other hand, you've got to trust your partner to do their job right.
Everyone on this board has common sense (although some may disagree with that statement
). I think we've all been in situations where we made a questionable call that we knew wasn't the best call we could have made. If your partner was there and saw it, then get things right. But keep your head on straight and don't have a conference everytime the coach asks. If a coach keeps asking about a pitch location, you'll start to ignore him or toss him. Same thing if a coach starts coming out and arguing every call.
If the situation warrants it, take whatever steps are needed to get the call right. But don't run to your partner on every close force play to ask if they saw the fielder pull their foot.