An arbitrator’s power to “correct” an award under CCP 1284 and 1286.6 is narrowly “limited to evident miscalculations of figures or descriptions of persons, things or property [citation] and nonsubstantive matters of form that do not affect the merits of the controversy. But an arbitrator also can exercise a nonstatutory power to amend the award if “an issue is omitted from the award due to the arbitrator’s inadvertence or mistake, the amendment is consistent with other findings on the merits, and the amendment does not cause demonstrable prejudice to any party’s legitimate interests.” Here, the arbitrator properly amended the award which had denied Starr’s claims for indemnity of attorney fees by adding a denial of Starr’s other indemnity claims.