Finally got the whole rig back together, been driving a couple of days. Took a longer drive, about 80 miles and on the way it started missing second gear on upshifting. Not throwing any codes, just shifts from first to third then on up. I can manually down shift from 4 to 3 and then on down to 2 and when slow enough to 1. Tranny only has about 7k miles on it since major rebuild by super reputable mechanic, has worked really nice, solid, firm, quick upshifts every time and not violent either. No hotrodding, seriously. Have been told to check the solenoids but the ATSG manual for this transmission says all failures for missing second gear are mechanical, but second gear is still there so it must be electronic? Right? What advice do you folk have to offer?