bad sector on SSD?

Yes, appears so. I guess flash pages (4K) could become bad or weak and the controller will swap them with one of the many replacement pages.

Reallocated sectors means the damaged sector is now invisible to the OS; current pending sector means a bad sector which is not yet fixed/swapped.
 
not a good thing but it doesn't necessarily mean the drive will continue to go bad like it often does with magnetic drives. I'd try to RMA it if possible, but I doubt they'll let you.
 
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