What is the test for a motion for a new trial for damages under the substantial evidence rule?

"The amount of damages is a fact question, committed first to the discretion of the jury and next to the discretion of the trial judge on a motion for new trial. [Citations.] All presumptions favor the trial court's ruling, which is entitled to great deference because the trial judge, having been present at trial, necessarily is more familiar with the evidence and is bound by the more demanding test of weighing conflicting evidence rather than our standard of review under the substantial evidence rule. [Citations.] [] We must uphold an award of damages whenever possible [citation] and 'can interfere on the ground that the judgment is excessive only on the ground that the verdict is so large that, at first blush, it shocks the conscience and suggests passion, prejudice or corruption on the part of the jury.' [Citations.] [] In assessing a claim that the jury's award of damages is excessive, we do not reassess the credibility of witnesses or reweigh the evidence. To the contrary, we consider the evidence in the light most favorable to the judgment, accepting every reasonable inference and resolving all conflicts in its favor." (Westphal v. Wal-Mart Stores, Inc. (1998) 68 Cal.App.4th 1071, 1078.)