I tried to check the pressure on the rear shocks and was surprised to see there Is zero pressure, I tried to put some air In and It does nothing. I disconnected the air ports going Into the shocks and there Is air coming out of both sides when I pump air for air pump, It just wont fill the shocks.

Dealer recently replaced rear fender, could they have disconnected something?

Thanks

 

If you can pump air through the lines that go to each shock and you've reseated the lines into the shock fittings, my first guess would be an issue with the schrader valve at the fill port? It's designed to allow the pump to seal to the port before it opens the schrader valve so you can get a valid pressure reading and requires a purposed function air shock pump.

If you're using a Progressive shock hand pump, is the o-ring in the end of the screw on fitting?

If you're using a bicycle pump, it will probably leak out the pressure while connecting/disconnecting from the port.