Replaced R engine bleed air regulator, running-up test OK, pressure same.

更换右发引气调节器，试车正常，左右压力一致。

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Due lack parts, for troubleshooting, interchanged bleed air regulator of R engine with L engine, running-up test normal.

由于航材缺件，为判断故障，左右发对串引气调节器，试车检查右发引气压力正常。

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