5 parity errors

Hi!

So here's a weird thing... In April, I ran a non-correcting parity test, and it found 5 errors. After doing some reading up, I then ran some SMART tests, those didn't find anything unusual, so I closed my eyes and hit the button to correct the errors. A follow up test ran and found zero errors.

Fast forward to this week, I ran the non-correcting parity test, and it found 5 errors. At the exact same locations as the problems from April (I log everything)

Jun 16 03:28:40 Tower kernel: md: parity incorrect: 1565565768

Jun 16 03:28:40 Tower kernel: md: parity incorrect: 1565565776

Jun 16 03:28:40 Tower kernel: md: parity incorrect: 1565565784

Jun 16 03:28:40 Tower kernel: md: parity incorrect: 1565565792

Jun 16 03:28:40 Tower kernel: md: parity incorrect: 1565565800

Ran MORE smart tests today, and everything is just as happy as can be. Out of 10 drives, 7 have 0 reallocated sectors, a 1tb has 9 reallocated sectors, another 1tb drive has 45 reallocated sectors, and a 1.5tb drive has 153 reallocated sectors, BUT... those have been steady and unchanged for over a year. That's the number of bad sectors they had after preclearing when I initially pulled them out of external cases I had from my pre-unraid days.

I have a new drive I want to expand the array with (swap out a low cap drive) But i don't want to do this if I'm going to get parity rebuild errors. What to do, what to do...