SONY PDW-F350 problem filter otpical unit

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ANDREA PUCCI
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Joined: Jul 17 2014

hello to all
my name is Andrea and use the cameras f350 for many years, I possess five.
lately I see the images from the cameras to change the definition and even color, until a short time ago by putting them in the preset I needed a few corrections to make them equal. jo discovered a terrible thing: 1-479-899-11 FILTER UNIT, OPTICAL is stained as if it were neckline.
are final, desperate because checking other cameras I've noticed that you begin to stain the other units.
spare parts cost a lot.
I know for sure is that optical glass, with a kind of filter, UV protected, because the ccd 1/2 inch of the camera are very sensitive.
advice and assistance
I am attaching some pictures
https://www.dropbox.com/sc/2hujryn87it67lm/AAA-ula4-ez2GrZdpbIs2eWLa

https://www.dropbox.com/sc/wyp3ssngftjixww/AACAydzmRY_jKsuj72YG6VKka

https://www.dropbox.com/sc/xpo4l4jw4zhe189/AACz2o1x8z1J87-UFusryZxNa

https://www.dropbox.com/sc/it3btq8lxe1qvkc/AADBgp5T3aoVo_XvP3SATitSa
thank you
Andrea Pucci