Just wanted to follow up on this, for Mike and anyone else interested. I followed Mike's suggestions, and everything looked/seemed to work OK. So, I took it to the Honda dealer where I bought it, where I discovered that it was out of warranty by TWO WEEKS.
It was determined that a new transmission was required with an estimate of $250 (on a lawnmower that is 3 years and 2 weeks old and cost about $500 new). The Honda maintenance manager seemed more interested in berating me for his perception of lack of maintenance on my part than helping me out, although he said he would call the Regional Service Manager, whose contact info is hidden from us hoi-polloi in the general population. I'm not optimistic; after all, I'm just a customer.
So, bottom line, I'll be leaving the Honda forum (I wouldn't have another on on a silver platter), and all indications point to joining the Toro forum. Thanx, again, Mike for your suggestions. --Irv