It happened to me too, probably a bug in tmo 2.5. I upgraded all again but in the next patrol with a salmon class the sub had no radar and no radar antenna, but sj radar was equiped in port, i had to load a previous game and remove the refit entry from NSS_Salmon.eqp (Conning tower 2).
;equiment cfg file, high level of detail
[Equipment 1]
NodeName=Z01
LinkName=data/objects/Conning_SalmonSargo_01
StartDate=19380101
EndDate=19420631
[Equipment 2]
NodeName=Z01
LinkName=data/objects/Conning_SalmonSargo_02
StartDate=19250701
EndDate=19300515 <---
[Equipment 3]
NodeName=Z01
LinkName=data/objects/Conning_SalmonSargo_03
StartDate=19430516
EndDate=19431231
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