i would seek a private doctor and have them fill out the DBQ for knees start it on ebenifits NOW you have on year to complete it they will retro pay you to the start date
just have your doctor to fill it out during exam then submit it
Mine had the same "Request 1 <VA MEDICAL FACILITY> for about a month. It showed a due date of January 13, 2017. Then suddenly on January 13, 2017 the eBenefits site updated and said that they received it on December 29, 2016. So there was definitely some lapse in reporting there. I had three C&Ps and no documentation from the VA -- all my physician information was from private doctors.
Today mine moved from 'Preparation for Decision' to 'Pending Decision Approval'. My completion date was also moved up too. Hope that helps a little bit in trying to figure out a timeline and possible decision.