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says it’s the tranny pressure stabilizer.
P0842 = Tran Fluid Pres Sensor/Switch A Circ Lo

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.
have an appointment tomorrow
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.
 

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Suspension lean forward when stopping could be enough movement to show a short or loss of contact in the harness/plug.
 

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Let us know what they find out.
 
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