An update... After about 6 weeks, the dealer had a Harley rep look at the seat to approve of the warranty replacement. Apparently, if the seat is not torn on a seam, a replacement must be pre-authorized. Anyway, the HD rep agreed to replace it, and it finally arrived & was replaced last week - almost 3 months to the day since first reported. I like the new seat - it seems to be more comfortable, and they definitely took care of the core cause of the tear. Unfortunately, the famous HD quality control was again a problem, as the day after replacement, the seam on the insert was split and unraveling. This time, the dealer was able to order a replacement without all of the pre-approvals, so hopefully I will get a good one before three months pass again.
During this same service episode, they also replaced the heated hand grips, which had gone from lukewarm to stone cold in their first three months of use. The replacements started off life a little warmer, but barely on the warm side of lukewarm.