Hello @johnra – John, I see this is your first post.
Welcome to Mayo Clinic Connect, an online community where people can share experiences and ask each other questions about any health issue.
We are not medical professionals who can offer medical advice.
I see the recall by Phillips you refer to is due to the filter media that has been used which could cause some health issues.
I would expect that there are many people who use CPAP machines that have a variety of illnesses, where the CPAP would not be relevant cause in any way. (not dismissing that it could not be however)
Being a cancer survivor myself, I can understand why you are seeking a reason for your diagnosis. I know for me, I ask myself quite often, why did this happen to me? I usually end at things just happen in most cases.
Are you on a particular treatment for CEL?
How are you feeling?