I just read about the EOS has problems and they talked about Canon EOS 5D owners are receiving these email.

Dear ,

Thank you for using Canon products.

We have discovered that, in rare instances, the main mirror of some EOS 5D Digital SLR cameras may detach due to deterioration in the strength of the adhesive. Accordingly, we would like to convey the details and our service policy concerning this phenomenon.

We offer our sincerest apologies to those customers who have been inconvenienced by this issue. Canon always strives to provide the highest quality products to our customers and we will spare no effort in our quality management to make sure our customers can use our products with confidence. We hope our efforts will earn your understanding.

Phenomenon

The main mirror of the camera detaches and images cannot be viewed through the viewfinder.

Affected Product

EOS 5D Digital SLR cameras whose main mirror has detached.

User Support

We will repair and reinforce the mirror portion of the affected products free of charge. If you own one of the affected products, please contact our Customer Support Center.

We appreciate your patience, and we offer our sincerest apologies to the customers using these products who have been inconvenienced by this issue.

Contact Information for Inquiries: Customer Support Center 1-866-422-2965 (toll free) 8:00 a.m. – Midnight, EST – Monday to Friday 10:00 a.m. – 8:00 p.m., EST – Saturday E-mail: carecenter@cits.canon.com
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