Automatic Transmission Control Module problems of the 2003 Honda Accord

I have a 2003 Accord 4 door ex with a v6 and automatic. I was driving along on the freeway at freeway speeds when suddenly the transmission seemed to have slipped out of gear and then re-engaged back into gear violently. Thankfully, traffic was light and I was able to limp off the freeway and onto a parking lot safely. After I came to a stop at the parking lot, I noticed the engine symbol along with the tcs and abs lights were illuminated. After the stop I had put the gear selector into neutral and found I had no forward or reverse in any selector positions afterward. Prior to the incident, the car was operating fine with no pre- indication of transmission problem. After a few minutes, I was able to get the car back into gear and proceeded slowly along city streets returning home. The transmission would shift erratically in and out of gear and then finally I was stuck in first gear with no up shifts. Dtc p0747 was stored. I replaced 9 quarts of atf-dw-1) and a filter (fk399) by myself. Honda shop service manual gave procedure for an oil strainer (Honda 25420-p7w-003), which is not accessible. A small filter element that can be replaced without disassembly of the transmission for access listed in the Honda illustrated parts breakdown as ( 25450-ray-003) and is available through Honda or an auto parts store such as o’reilly (fk399). I believe that the clean atf helped free up a sticking clutch pressure solenoid valve when the vehicle reached operating temperature and the pcm activates the solenoid.

While in top gear the transmission would suddenly shift out of gear causing a jolt. Within 20 minutes of this happening for the first time the car would no longer shift into top gear but I was able to get home in lower gear. The car has been owned by my parents and myself since it's purchase, it has never been driven in a radical manner and it has been serviced at a Honda dealership following the extreme maintenance schedule. The transmission is to be changed and the pcm also. The car has 144000km. I have seen that in the us Honda is covering the transmission in these years for up to 160000km as a result of a class action suit. Honda canada unfortunately has no such coverage and the deal they are offering me is 2800$+ tax for the repairs instead of the 7000$ they claim it should be costing me. Independent transmission company's have given me prices of 2500$ and 2800$. It makes em feel that they give me an extreme price so that they can give me a "rebate" which works out to not being a deal at all. I'm very disappointed that Honda is not standing behind their product and that their product is no where near the quality that gave Honda the reputation it earned in the 90s.