98 Civic EX 2 door: CEL P0700 & P0715 - and D4 light blinking
 

Howdy Honda Gurus,

My 1998 Civic EX 2 door coupe with 127.7k miles has been showing the Check Engine light for a week now - got it checked at a local Meineke and the codes are P0700 and P0715 - also the D4 light is constantly flashing for the last couple of days. There is no discernible issues/change in the driving experience except the engine sounds louder and sometimes it accelerates slowly. Took the car to a local tranmission shop and got an estimate of $432 for electrical diagnosis test $120 + a transmission fluid flush(73.50+54) and if required $151 for input turbine speed sensor.
I believe Honda has a TSB on this (01-012). I saw a fellow member was able to get this resolved under an extended emission warranty( https://www.hondacivicforum.com/foru...i-p0715-65842/ ) - so I called Honda customer care but they said the TSB does not apply to my 1998 Civic.
Will be buying a bigger car before the end of March - intend to keep the Civic as a secondary - for occasional use (if the cost to fix this transmission issue is not in the thousands) - so I am trying to figure out what makes the most sense :
1. Should I bring the car to a local dealer ? They said they will diagnose for $139 and if I get the work done there - the testing cost will go towards repairs.2. Drive the car as is - and try to find a local mechanic when I'm there next month.
3. Get a transmission drain and fill - believe a trans flush is not usually recommended(Transmission flush - good or bad idea?)

What would be the minimum amount of work(money) I can get done to fix this ?

Please advise on the pros and cons(risks) of each option and what makes the most sense.

All input is highly appreciated.

Also, is there something I am missing in reference to coverage from Honda for this problem - I see that the gentleman who was successful in getting this done from the dealer under an extended emissions warranty had a 96 Civic and someone mentioned 96-98 model years in the discussion on this issue -
https://www.hondacivicforum.com/foru...i-p0715-65842/

Thank you!