Super Cell Marine Fender Sagging

[jonaspmr]

Has anybody had experience with the Bridgestone Super Cell Fender (

http://www.bridgestone.co.jp/english/diversified/marinefender/t_s_cell.html)

? We've had one installed for a number of years and the rubber is starting to deteriorate and the support chains are slack causing the pads on the frontal frame to become skewed.

Does anybody know what the deisgn life of these is meant to be or have any experience with repairing them?

Thanks in advance