General | Combat Stamina
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Cannon Master (Combat)

Source Inner Sea Combat pg. 17
You have learned how to keep firearm siege engines ready for battle despite harrowing circumstances.

Prerequisites: Siege EngineerUC, Knowledge (engineering) or Profession (siege engineer) 7 ranks, proficiency with at least one firearm siege engine.

Benefit: You gain a +2 competence bonus on any Craft (siege engine) checks made to repair a firearm siege engine. In addition, if you are the crew leader for a firearm siege engine with the broken condition, that siege engine’s misfire range is increased by only 2 instead of by 4, and the broken siege engine must misfire twice before it explodes.

Combat Trick (from the Combat Stamina feat)

Source Weapon Master's Handbook pg. 24
While acting as the leader of a firearm siege engine crew, you can spend 5 stamina points as an immediate action when the siege engine rolls a misfire to negate the misfire.