Zero compression sounds like stuck valves!
I have the same problem having just done the water pumps. Our carrier has sat unused for about 2 years inside. I got it running but it didn't sound right, so I shorted out the spark plugs one at a time with a big screw driver - many of them made no difference to the running, but some caused it to die.
I'm waiting for the "Team" to look at it. Removal of the Intake manifold gives access to the valve stems and guides.
more later!
Rob
LP2
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