RedJedi, not sure about the warranty side of things. But I assure you it's not a big job. A set of screwdrivers, spanners. Very simple to do. Remove the indicators (flip them out) remove the trim on the front valence over the bumper top. Turn your wheels one way, peel back the black wheel arch, undo the screws behind them. Repeated the other side on full lock. Now undo the bottom row of screws under the front of the bumper. Next peel back your carpet to get at taking the front light units out, 1/4 to 1/2 turn should release them forwards, wriggle them by hand, gently forward and put somewhere safe out of the way. Now put a thick'ish cloth under the front to catch the bumper (we don't want any damage to that when it comes away). Now carry on undoing the top row of screws. Have a quick wriggle of the bumper to see if it's free or where some screws are left to come out.
Once the bumper is off, it's plain sailing. You should see where the two faces meet, one from the alu pipework and the other face from the condensers themselves. I'm trying to remember the next bit, I think from memory it's allen key bolts which tighten the two faces together. Use a strong adjustable spanner on the block and allen key to undo the bolt. Remove the condenser. Then it's simply a scenario of fit the new condenser, connect the alu pipes back up. Screw the bumper back on. Clip the indicator lights back in. Slide the headlights back in, & lock them in position with the cam, 1/4 to 1/2 turn (it'll click when in place properly).
Then a quick trip to the local regas service. Enjoy the cool air.
You can pick them up for about £50 ea on Ebay. You can have the whole job done on a driveway in a few hours. No special tools or a GCSE in mechanics. It really is that easy & you should be able to watch YouTube videos of it being done to give you some confidence of how simple it is. A lot of Porsche owners can do this blind folded if they are keen to remove the autumn leaves to stop them rotting before winter storage or winter use.
Matt