I just replaced the OVP in my 300TE. I opened it up for fun, and it had about a .25 inch layer of wet crud on the inside bottom that was like toothpaste. The design of that OVP, even with that seal around the cover over the fuses, allows moisture and dust to get in and corrode everything.

I had another one that went bad years ago, and here it is opened up. Corrosion around the inner connections, and the board clearly blew out somehow. I opened the case around the relays, and as it is completed sealed, the relays themselves look great with no environmental damage.

I am tempted to take silicon and seal the fuse cover shut, to prevent moisture and dust getting (but easy to open if fuse blows).

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