I replaced the parity drive with a new 4TB drive as well as disk 1 with a new 4 TB drive as the original disk 1 was having smart disk failures. I followed the steps on the Wiki to replace the parity drive, this completed in about 12.5 errors. I then replaced the disk 1 with the other new 4TB drive. This took just over 10 hours.
When I attempted to bring the array back up, disk 4 is now unmountable. This was a surprise as there was never an issue with this disk. I put the array in maintenance mode, and ran a disk check in the gui for disk 4. There were errors and it recommended to run reiserfsck rebuild tree. I did but no change. Not sure how to get of this mess.
I've attached the logs and screen shots. Running Unraid 6.6.7. Any help would be appreciated.
mymediasvr-diagnostics-20191215-1633.zip