MEMORANDUM

Federal Insurance Company appeals the district court’s judgment in favor of St. Paul Fire & Marine Insurance Company. The district court had jurisdiction pursuant to 28 U.S.C. §§ 1382 and 2201, and we have jurisdiction pursuant to 28 U.S.C. § 1291 . We reverse and remand for recalculation of the parties’ obligations.

I

In California, an insurer owes a broad duty to “defend a suit which potentially seeks damages within the coverage of the policy,” Gray v. Zurich Ins. Co., 65 Cal.2d 263 , 54 Cal.Rptr. 104 , 419 P.2d 168, 176 (1966), “or if the complaint might be amended to give rise to a liability that would be covered under the policy,” Montrose Chem. Corp. of Cal. v. Superior Court, 6 Cal.4th 287 , 24 Cal.Rptr.2d 467 , 861 P.2d 1153, 1160 (1993). “Any doubt as to whether the facts establish the existence of the defense duty must be resolved in the insured’s favor.” Id. So it is only “in an action wherein none of the claims is even potentially covered because it does not even possibly embrace any triggering harm of the specified sort within the policy period caused by an included occurrence, the insurer does not have a duty to defend.” Scottsdale Ins. Co. v. MV Transp., 36 Cal.4th 643 , 31 Cal.Rptr.3d 147 , 115 P.3d 460, 466 (2005).

There is no dispute about the duty to defend once Fujitsu’s second amended complaint was filed, but we believe the obligation to defend was triggered earlier, when Fujitsu brought a counterclaim in Cirrus’s 2001 action. We cannot say that the allegation in that pleading — that un predictable short-circuiting after the chips were put to their intended use rendered Fujitsu’s drive inoperable — “does not even possibly” embrace harm contemplated by the “sudden and accidental” exception to the impaired property exclusion. Id.; Anthem Elec. Inc. v. Pac. Emp'r Ins. Co., 302 F.3d 1049, 1059 (9th Cir.2002). The policy’s example of “sudden and accidental” damage supports this conclusion. Nor does the extrinsic evidence upon which St. Paul relies regarding the cause of the short-circuits lead to a different result, as it fails to “negate[] all facts suggesting potential coverage.” Scottsdale, 115 P.3d at 466 . Thus, the counterclaim gave rise to the possibility that the exception to the exclusion applies.

We remand to the district court so that the parties may recalculate their obligations consistent with this disposition.

II

Federal waived its claim to indemnity under St. Paul’s Commercial General Liability policy, as it failed to preserve this issue before the district court.

REVERSED AND REMANDED.

This disposition is not appropriate for publication and is not precedent except as provided by 9 th Cir. R. 36-3. . The language of an insurance policy is to be construed against the insurer. Gray, 419 P.2d at 172 n. 7. . For this purpose we assume (as St. Paul argues) that it was Federal’s initial burden to show the possibility that the exception applies. See Sony Computer Entm’t America, Inc. v. Am. Home Assurance Co., 532 F.3d 1007 , 1020 n. 8 (9th Cir.2008).