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Q: TCS and engine light-code PO740 TCC CKT malfunction on 2003 Honda Odyssey

2003 Honda Odyssey, 64,000 Miles. Always TCS and engine light come on at the same time. Used Actron auto scanner 9180 and found code PO740 TCC CKT malfunction.
History-I noticed trans. leak 2 years ago. My mechanic changed the trans. oil at the time, but the leak continued. For the past few months I have noticed that when the RPM goes up(specially in 1st gear), the car is low to respond. The oil dark in color.
I have read many contradictory articles and opinions as to what to do next. Example. Change oil or not. Flush oil or not. I would like to hear from all smart/wise mechanics out there as to what I should do and why.
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You Will need a trans.-Unfortunately Most warranty extensions on that model year are expired by time. If your mechanic has not used actual Honda fluid ( not aftermarket that says 'for use in hondas')-that does not help. DO NOT 'FLUSH'---DRAIN & REFILL--- approx. 3 quarts per fill do that several times. Check fluid on level ground after fully warmed up- Honda's definition is after driven 10 miles- and remember Hondas are checked with the engine off. Wait about 1 minute then check dipstick. If the trans has already been flushed 'differently' , then I recommend stashing $ for a trans- P0740- Honda's recommended repair was & is trans replacement , not solenoids. Solenoid replacement just prolongs the pain. As far as the assistance from American Honda.... worth a shot , but If you have little or no history of service at a dealer then it is unlikely. Good luck.
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It could be 1 of 2 problems. It's either the torque converter clutch solenoid valve, or the A/T clutch pressure control solenoid valve C. But, there are procedures that a mechanic would have to do to find the answer to the problem.
What are the costs for the poss. repairs. And what are your thoughts about oil change or oil flush? Some say to do it, while others strongly disagree.
I would recommend getting some assistance at Honda. You may check to see if there is an extended warranty coverage on your transmission. The torque converter on some Odysseys do have extra coverage. Worth a phone call or visit. If not, I would still escalate the concern with American Honda, as with your low mileage you may be able to obtain assistance.
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