Looking for HP server hardware expert

I need assistance with a few tasks for our HP servers.
You must have good and long experience in HP server hardware questions.

We have 3 HP servers, a few years old, of different models:
1) ProLiant DL160 Gen8
2) HP ProLiant DL120 Gen9
3) HPE ProLiant DL360 Gen10

The first, has some cache issue .....
Smart Array P420 in Slot 2 "CACHE STATUS PROBLEM DETECTED"
I need help to solve this.

Then I need help to get som spare parts in reserv for all of them.
Especially spare fans for all three.

Thanks,
/Dan Erik
ServIT AB (Sweden)