[Frank64]

I was winterizing my 2019 3791RD this morning after draining water lines and hot water heater. I did not have any issues with kitchen/bathroom sink/shower. I decided to hook up to the washer cold line next and run hose to commode. I had at least a 1/2 jug of anti-freeze if not more in container when starting on this line. When i opened the valve the pump starteded running after a solid minute i was not getting any antifreeze coming out.
1) could the pump have lost prime. How to remedy this
2) could the pump diaphragm or some other mechanical mis hap taken place
3) how to access pump to inspect


Any help appreciated

Frank