[Perfectlap]

The PCNA service manager asking if the car was serviced at a Porsche dealer seems ironic.

1-They were recommending oil change intervals that made the problem worse.
2-They were using oil (M1) that at some point changed for the worse.
3-They probably never inspected the oil filter for the cracked pepper size seal fragments.
4-They never advised their Boxster/996 owners that they should be putting a minimum number of miles on their cars per month to maintain proper IMS bearing lubrication.
5-They never informed the Boxster/996 owners that there was an issue whose cause had not been fully determined so they should take steps to address 1 - 4 above in accordance with the 'precautionary principle'.

What I'm saying is that you'd probably have been BETTER off with an indy Porsche specialist, or a well-informed and unconflicted specialist, leading up to the IMS failure.
Or stated another way, you were WORSE off going to the dealer for service.
Actually you may not have had the failure to begin with if you opted for the specialist over the dealer.