2004 Honda Pilot Codes P0700 - P0845 - P1740

Any advise and help would be very much appreciated.
The transmission "D" light on the dashboard start flashing every so many days.
The car shifts & drives fine, but I noted sometime it hesitated to shift from 4th to 5th @ 60mph 2800rpm, so I would released a little pressure on the gas paddle & reaccelerated. By doing this it dropped to 2000rmp & shifted to 5th. Or if I kept the foot on the gas paddle. It will eventually shifted to 5th at about 3100rpm 70mph.

Anyway, took to Honda and they pull codes P0700, P0845 & P1740.
They explained:
P0700 = Auto Transmission Control System
P0845 = problem in 3rd clutch pressure switch circuit
P1740 = problem in 4th clutch pressure switch circuit

However, they said they will not just replace the 3rd & 4th clutch pressure switches per codes P0845 & P1740. But they will have to replace the WHOLE transmission because there is a code P0700.

I just thought if it is really necessary to replace the whole Tran when there is a code P0700.

Thanks a lot for looking