i think your plant partially died. looking over the last couple diary weeks.. when it turned brown was that immediately following your pump issue? the outer portion likely died.
if this is the case, harvest asap.. just inviting some sort of rot or worse... i'd thoroughly inspect it for issues as is.
something isn't right... maybe ask someone you don't like to test smoke it, first :P jk
Some plants don't amber up, fyi. always good to use more than one observation to pick your harvest date. though due to pump malfunction and potential damage that did, hard to tell if that was the case here. your plants went from green to brown in a short period of time, it seems.