Recover BTRFS RAID

So I had an RN316 and the power supply died, I did not have time to organize another ReadyNAS to recover the data but in the end I realize I should have made a plan!

I was running 4x 2TB XRAID

I mounted the four drives successfully using mdadm btrfs-tools and managed to copy "all" of the data I needed.

Like an idiot before going through everything properly and making sure I didn't need anything else I decided to re-purpose one of the drives (i.e. it was formatted)
A day later I realized there was something I completely forgot to backup during my recovery.

I was pretty sure that I would be able to still recover in degraded mode since I still had 3 out 4 drives, so I mounted the 3 drives with no problems initially and could get to the data but during my copy I started to get input/output errors on the array.

I eventually figured out that one of the SATA cables was faulty and just gave up midway through my copy.

I replaced the SATA cable but now I cannot mount the array.

Below are is the output from mdadm --assemble --scan and mdstat

I"m thinking that I just need to run a fsck or whatever one would run for btrfs?

Any help would be appreciated.

mint mint # mdadm --assemble --scan 
mdadm: /dev/md/0 has been started with 3 drives (out of 4).
mdadm: /dev/md/1 has been started with 3 drives (out of 4).
mdadm: /dev/md/data-0 assembled from 2 drives - not enough to start the array.
mdadm: no devices found for /dev/md/data-0

mint mint # cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] 
md127 : inactive sdb3[3](S) sdc3[4](S) sda3[5](S)
      5845988521 blocks super 1.2
       
md1 : active raid6 sdb2[0] sdc2[2] sda2[4]
      1047552 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/3] [UUU_]
      
md0 : active raid1 sda1[5] sdb1[3] sdc1[4]
      4192192 blocks super 1.2 [4/3] [UUU_]
      
unused devices: <none>