Walk behind HRX217TDA not propelling

Hello all, I'm a new guy, and sure hope someone can assist me on this. I have a HRX217TDA. 2 weeks ago the propel speed slowed a lot nearing the end of my grass cutting. I was able to grab the clutch levers cable at the spring and give it a yank - and hold - to finish the job. It seemed so logical it was a cable adjustment needed. I did that and no change at all. I then replaced the belt and again no change. I notice the lever to engage the propel drive says "clutch" on it, but where is this "clutch"? It feels just like that - like the clutch is slipping, but I can only find the transmission assembly (20001-VH7-003) or the belt that relates to the drive system. Does this non-serviceable transmission cause a slipping clutch feel when it goes bad? There is no grinding at all.



Please advise - and it won't hurt my feelings if I overlooked something super obvious.



Thanks,