My MP40 wet side has cracked and the magnets completely rusted... it is several years old and worked flawslessly, but still shouldn't fail like this. I have had a few ICP results showing high metals and couldn't see anything obvious, I changed cabinet hinges etc and eventually after a few months I decided to reinspect everything more closely, As I had lost a few SPS colonies, I really never expected to find so much damage and rust behind the rear plate... very unimpressed. If these wet sides have a finite lifespan we need to know as a part designed to specifically work underwater should not fail like this...