I've read a number of discussions and articles that suggest that the problem I'm having is caused by a bad TCC solenoid. The symptoms most often include pulsing under light load. I get this under light load and just after a shift up or down.
It doesn't happen every time. Actually, it used to be extremely rare but the frequency is definitely increasing.
Otherwise, the car runs well. From a stop to cruising speeds, it's all good as long as it's a steady foot. Hard acceleration at all points on the speedo are good. Shifting seems to be fine in all gears in both directions.

Can anyone confirm the cause?
https://youtu.be/abIH4ltBfMk
https://youtu.be/P__VU38zys8
https://youtu.be/CAkQ5rBN0iM

Thanks