When I was working for a Beachcomber dealer, we did have many claims denied. These claims were not denied by Beachcomber, but by Cornerstone, the seller and administrator of Beachcomber's "Premium Guarantee" which extended the standard warranty from 2 years to 5.
One side note on that comment:
At the time, Beachcomber had informed Cornerstone that they would not be using Cornerstones program on tubs manufactured in 2004 or going forward.
I believe that may have ticked off the good folks at Cornerstone and they may have taken a "work to rule" or "every 'I' must be dotted and every 'T' must be crossed philosophy.