Failing a Skill Check while repairing:

Prevents the Generator Explosion.
Applies the default Regression penalty.
Applies an additional Regression penalty of 5/4/3 percent.
Technician reduces the audible range of your Generator-repairing noises by 8 metres.

Increases your Healing speed by 100 percent when healing a dying Survivor.
When performing any of the following actions, Were Gonna Live Forever gains 1 Token:

Performing a Safe Hook Rescue
Taking a Protection Hit for an injured Survivor.
Stunning or Blinding the Killer to rescue a carried Survivor
Consume 1 Token to grant the Endurance Status Effect for 6/8/10 seconds to any Survivor healed from the Dying State

While repairing Generators, complete 5/4/3 Good or Great Skill Checks to activate Rookie Spirit for the remainder of the Trial:

Once active, the Auras of any regressing Generators are revealed to you.

After being unhooked or unhooking yourself, instantly gain 40/45/50 percent to your Healing progress.

Increases your Action speeds in Repairing, Healing, Sabotaging, Unhooking, Vaulting, Cleansing, Blessing, Opening, and Unlocking by 3/6/9 percent when in the Injured State.

Increases your Walking speed by 10/15/20 percent.
Unlocks the ability to see your own Scratch Marks.