P0842 = Tran Fluid Pres Sensor/Switch A Circ Losays it’s the tranny pressure stabilizer.
P0700....just triggers the dash light to illuminate.
Electrical in nature, perhaps a harness check over look see?
Service done (changed some fluid) probably had no issue with the code/issue being silent for a while. Clear the code and see if it comes back.
Electrical in nature,
It's NOT a new trans required issue, I wouldn't stress much on it.
Hopefully it's a shop with Allison experience. But I think with the intermittent occurrence and no other codes thrown, it's probably going to be a harness issue.have an appointment tomorrow