[Johnnyboy]

I have had this issue on other coaches, more than 3 times in my coach ownership life. One trick is to take a hairdryer and warm the Allison TCM box. If this persists send it to Transmission Instruments is Texas. Around $600 for repair, capacitors go bad in these boxes. If you go to Allison they will sell you a rebuilt box for $3500.

https://www.transmissioninstruments.com/