If this is recent, it could be either soiled/worn pillows or headgear.
I mentioned sound sensitivity because of OP's previous posts.

I feel that some "dirt" is beneficial by exercising our immune systems,
but knowledge of the processes is useful if they are needed--but only then
For example, I became much more conscientious during chemo.
After chemo, I welcomed my first runny egg in months.
And tap water!

It appears that you are sensitive to sound, and have been for some time.
There are solutions, you need to speak to your doctor.
If it affects your sleep, insurance may cover therapy or devices, whatever is needed.

I like how proper diagnosis has finally become a medical objective. My tonsils and adenoids were removed at age 6, due to frequent infections. My illnesses continued for decades, until I was finally prescribed an antihistamine. "DAMN!, Is this how other people feel all the time?" Obviously, medicine...

I wonder how the 5 year built-in service plan with Medicare balances out
with the initial profit of cheaper machines versus reliability of resmed equipment.
Perhaps repair statistics can influence sales?
One can hope.

Sending you a wet cyber-hug, because it can't hurt--I hope.

I surely will not.
Never buying respironics----PRICELESS!

You need to know the "secret handshake" to unlock the clinical menu. In most modern machines, it may be holding down two buttons at the same time for several seconds. Aside from the actual manual, trial and error may be your best bet--good luck! You could change the title of your original post to in...

Unless something seems to be "off" don't worry about it.
Normal lifespan is close to the Medicare 5 year line.
Get a back up machine, and sleep well.
Cpap.com and secondwindcpap.com are excellent sources.
OOP, unfortunately, so buying local is beyond foolish.

When we fill out the equipment part of our profile, our stuff is on every post
--in case we need help.

ZOMBIE THREAD
Initial posts are several YEARS old.
The OP may be "history".
My regrets . . .

Congratulations on getting past your medical inertia.
It took me about a week to finally inject insulin, though
most of us here dive into cpap like new clothes or gadgets.
The first masked night is an accomplishment, but by no means the finish line.
Keep on pushing forward.

----"I was prescribed an APAP with pressure range of 5-20."
Why was no titration test prescribed?
Were you encouraged to tighten the range, since you had an APAP?
Odd, IMO.

Latest ban went away for few days. Now I’ve just been banned again. Beginning to feel just a bit picked on here. Should I be paranoid? They do seem to be after me. Not likely. I suspect that scammers are using random addresses for their dirty work, and "somebody" is finally cracking down on them. A...

Good luck with that.
Hopefully your machine is under some kind of warranty.