The diagnostic tests perform a partial inflation and deflation and reports the pressure in the accumulator... everything looks good.
The error is a fill request but during the test the fill request is fulfilled.
Incidently I had to replace the fron left level sensor but that has nothing to do with the fill error, that came up as a secondary error.
I wonder what the expected presssure vs time is... with that info, I might be able to see if the compessor is working correctly