Everything seems like it should be.
-You have tried to replace a missing disk with a missing disk, resulting in an error
-You have a Spare that replaced this faulted disk (Spare is now in use)
Insert a working disk and do a
zpool replace c2t5000CCA369CD615Fd0 'new and working disk'
A resilver will start and after that your spare is available again
-Clear remaining errors
Thanks for your response and helping a ZFS noob.
Here are a few things that I want to accomplish (not necessarily in the correct order).
1. I want to remove "c2t5000CCA369CD615Fd0/old" & "c2t5000CCA369CD615Fd0" from the zfs_p1 pool (so no longer visible via zpool status.
2. The INUSE spare "c2t5000CCA36AC2ADB6d0" should be set to ONLINE
3. zfs_p1 should change from DEGRADED to ONLINE
NOTE: Previous tests of the c2t5000CCA369CD615Fd0 disk using DFT showed no errors. So I am not sure what is wrong with this disk, why it originally faulted. I need to figure out what other tests I can run on this Hitachi 5k3000 HD.