yeah, I was thinking the same thing. The trans shifts fine and all that, I drive it every day. but the lock up is funny, and it is throwing the no lock up code.
The trans was rebuilt about 6 years ago and the rear clutches were toast. The line pressure was way low with a port test prior to tear down and found the converter valve partially ejected due to a broken retainer, its a little sheetmetal piece that holds the valve and spring in and at rebuild I put the upgraded retainer in it which does away with the little sheet metal thingy
If that part was on the top of the valve body it was the boost valve.
As for adding engine oil - the RE/RH family of transmissions do not have PWM solenoids to actuate and control lockup like the FWD stuff does.
Two different worlds.
If it’s setting 1776 code there are quite a few things that will set that code.
