Your parity drive is ready for the scrap yard
5 Reallocated_Sector_Ct PO--CK 073 073 005 - 7456
Disk 1 is above my comfort level
5 Reallocated_Sector_Ct PO--CK 100 100 010 - 952
Disk 2 actually looks good, but simply a connection issue. Reseat everything to it, then rebuild it.
Only after a successful rebuild should you replace the parity drive. Because of the massive amounts of reallocated sectors on the parity drive, you may have some corruption
And also, make sure you have notifications enabled so you'll get an email / push notification if your drives degrade further (and if any replacement begins to degrade)