Ok, new development in the ongoing saga of my stupid transmission:

The other day, I started up my VX, and was shifting into drive. I went a little too far and accidentally put it into 3, realized what I did, and then shifted into D. The thing is, I had already started giving it gas as I was shifting, so I think it did something weird. I didnt notice anything strange, but when I looked at the instrument panel, the D light was not lit.

I drove it for a bit, then stopped and turned off the car. I restarted, shifted into all gears while stopped, and checked the dash lights. All shift lights come on when appropriate, except for D.
I have driven it a couple times since then, and the D light still will not come back on.

Does this give anyone any ideas as to what I need to have replaced next in my quest to fix this issue?

As a recap (to those that have not been following:

I have an intermittent missed shift at 27/28 MPH. It wont shift into the next highest gear somethings.
I have tried to get error codes, but it doesnt throw any.
I have replaced the Mode Selector Switch with a new one. That did not fix the problem.