It's a pretty simple job to replace the igniter on the XXV, unless the rear of the stove is backed into a corner like mine. Anyway, here's how to do it.
1. Shut the stove down and after it goes off, unplug it.
2. Open the front door and remove the two thumb screws and plate that gives you access to cleaning below the firebox.
3. Remove the two screws facing front above the clean out opening. The igniter will come free and fall down. Note how the wires are routed. They come away from the igniter, and are routed low straight out the back.
4. On the left rear side of the stove, just below the control door there are two bolts that hold in the lower left panel. Remove them and the panel will slide out.
5. You will see a pair of yellow and pale blue wires coming out of a small rubber grommet. It is secured to the stove with a little silicone caulk. They travel up inside the stove where they are secured to the stove with a tie wrap. Cut the tie wrap.
6. Where the wires enter the grommet, cut the caulk away being careful not to cut the wires. Pull the grommet and wires out of the hole. This will loosen the wires so that you can now pull the igniter out of the stove from the front and the blue & yellow wires will follow.
7. Pull the igniter out far enough until the connectors are accessible. Disconnect the igniter.
8. Remove the igniter from the bracket by twisting the two tabs with a pair of pliers and removing the plate they are holding in. The igniter will then slide out of the bracket.
9. Place the new igniter in the bracket and secure with the plate and a slight twist to each tab.
10. Connect the two wires from the igniter to the two connectors in the stove. Remount the igniter bracket back inside the stove.
11. Route the wires from the igniter down to the lower right corner of the area beneath the firebox and out toward the back of the stove. Be sure the wires do not touch the metal plate with all the holes in it. Otherwise, they may be damaged and you'll be buying another igniter.
12. Pull the blue & yellow wires from the rear of the stove back into the rear compartment. Secure the grommet back in the hole to hold them in place.
13. Get a tie wrap and re-secure the light blue & yellow & the third wire back where they were originally.
14. Make a final check to be sure that none of the wires are anywhere in the way of the chain or the blower so there won't be any issues when you start it back up.
14. Put the lower panel back with the two bolts.
15. Plug the stove back in and fire it up.