NEW 2442bs gray tank 1

[jdpm]

Just took delivery of a 2022 Rockwood 2442bs fifth wheel. I have not used it yet.
The dealer supposedly did a pdi and test of the plumbing system including holding tanks. The tanks were emptied by the dealer after his pdi prior to my taking delivery. I have had the rig home for 5 days after towing it home 9 hours from the dealer.
My gray tank 1 still reads 2/3 full even though the valve is open. Thoughts on where to start? Thanks

[Old-Biscuit]

Faulty sensor.......
Sensor has fallen off tank, wire has come loose from sensor etc

Have to open up underbelly to access.
Dealer/Warranty issue
BUT a 9 hour drive one way is NOT worth it

Fill/drain tank and see if 'readings' change

[jdpm]

Must have been some trash on the sensor because on our first trip out it cleared up and appeared to work fine during and after. Thanks