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Transmission service necessary when replacing Pressure Switches?

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Hey all..I have a few questions about the 3rd and 4th grear pressure switches and when to do them and what service needs to be done injunction with replacing the switches (if applicable).

After doing some digginng I found that I need 3 switches and 3 gaskets:
2 x 28600-RKE-004
1 x 28610-RKE-004
3 x 90471-PW7-A00 (gaskets)

I have an 07' Type S and right now have an A123 code, which means, oil change, tire rotation, cabin/engine filter and transmission service. I currently have 85k miles on the vehiclle

I got the tire rotation done for free at discount and plan on doing the filters myself since its a 10 min job.

I plan on taking the car to the Acura Dealer for the transmission service and its around $100 for this job. I probably won't do the 3 switches/sensors just yet. I plan on buying the parts at least from acura parts warehouse or somewhere similar to save a little money. I don't plan on doing this myself. (FYI the car has 85k miles on it, and ive owned it since 18k miles, as far as I know the switches have never been replaced)

So here are my main questions:
When replacing these sensor/switches (all 3 with gaskets):

1. When the parts are replaced, do you have to do a transmission service along with it or can you just just replace the switches alone?
2. Should I wait until 105k miles (when I plan on doing timing belt service) or is that too long? If not, maybe i'll do it at 90k, but this depends on answer #1 if I need to do a tranny service with it.

Thanks for the help!

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