OK, now that we have cleared up the parameters, are you able to recommend an approach that I might use to technically convince the service people at the dealership that this problem exists and hopefully
have them correct the problem under the drivetrain warranty? Possibly even replace the transmission as it seems as this could be a eventually terminal problem.
By the way, all recommended services have been properly undertaken on this car - which includes a transmission lubricant change at the appropriate miles.
I would like to be able to intelligently advise them on the need to continue to road test the car to duplicate the problem as they seem not convinced of its existance. I would assume since my research on line has found no one who seems to have experienced this malady in this make & model that there must be some sort of abberation that took place in manufacture.
In addition, I'm not able to get a very good explanation from the technician as to how the shifting mechanism works and how it could be the cause of the problem as he theorized but wasn't sure of.
Again the tech claimed shifting mechanism operates the gearbox with some kind of electrical/electronic solenoid (???) plus some sort of cable mechanism connected to the gear shifter lever. I've never heard of this.
I'm wondering if anyone has had a similar issue? And if there are any Tech bulletins that address this? I believe this engine/transmission combo (2.4 liter 4-cyl. + 5-speed manual-front wheel drive) is used in a number of other similar year Toyota models - possibly Camry & RAV4.