The last set of updates made to the 3303 that have been referred to in this thread were done in 2008, so if the watch was serviced in 2010 by Omega, those parts would have been replaced at that time. The OP should have had the replaced parts retuned, so if you still have those parts in a small plastic bag and can photograph them, I can confirm if that has been done.
As for the other two parts mentioned, those are somewhat puzzling, and are not related to the upgrades mentioned previously.
Off the top of my head, the only reason I can see that the chronograph bridge may need replacing is because it has been damaged by a screw that has come loose and been caught between the rotor and bridge, causing damage. This is listed as a specific reason for replacing parts like bridges in Omega work instruction 14 for quality service criteria. Unless there is a component on that bridge that is damaged and is not available as a replacement part (fairly common actually) that may be another reason - I have had to replace entire bridges because one small part on the bridge is worn, and is not available as a separate part that you can buy an exchange.
I do wonder if they have called out the wrong part when they talk about the automatic device framework. I can't thing of any reason to replace that part, so my guess is that they mean the part that mates to this part - the automatic device bridge. This movement uses a bearing for the rotor, but instead of being in the rotor, it's pressed into the automatic device bridge as you can see here:
The bearing itself is not available as a separate part, so when the bearing wears out, the entire bridge must be repalced.
Regarding why these parts are charged on top of a regular service, it's for the simple reason that not all parts are included in a factory service, contrary to popular belief.
If the OP goes through with this, it would be interesting to see photos of the parts Omega has replaced...
As for finding a cheaper alternative, I think it's difficult to say if that would work out or not. First off, based on discussions I've had with the trainers at Omega, many watchmakers shy away from this movement for some reason. I don't find it a difficult movement to service, but there are a few things that are maybe not as easy as they are on other movements. For example many of the screws can be installed in multiple locations, but they will cause problems if you mix them up - in training I had kept them all with the parts they went with, but the trainer asked us to put out all the screws sorted by function and leave them on our bench. He then came along and mixed them all up, so we had to g through the process to verify that we were putting the right screw in the right place.
So finding someone who works on these regularly is the key, and if they don't service them regularly (or have a parts account) I would consider using Omega. For sure an independent could use the crystal over again if the scratches aren't bad, so you would save there but it's unclear if the other parts could be assumed to be okay or not.
Cheers, Al
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