By service mode, not sure if you mean removing the front clip or not. But you will need to move the front clip forward. This will entail removing your front bumper, 2 torx bolts that hold the front clip to the chassis, and your torx bumper shock bolts. After this, you can simply slide the front clip forward and this will provide ample working room. Tension will be on the belt and waterpump, so you are going to have to replace the tensioner or reuse it if you feel lucky (I have compressed my current tensioner maybe 3 times and placed the pin back in before I left it in, so it is doable). You will just need to make sure that the belt does not move from any of the teeth on the crank gear or cam gear (with the front clip forward, you can even remove the serpentine belts, covers for the crank gear, and mark it so you know it is at the same spot). With the front clip forward, you will have more than enough working room.
-drain coolant
-remove TB cover (one that clips to valve cover)
-remove tensioner
-replace water pump
-place tensioner back on
-fill up with coolant (bleed properly)
-good to go
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