not sure, but:
TB=Treibstoffbunker, Treibölbunker, in this case I think its Tauchbunker / buoyancy tanks.
K=Kombüse/kitchen (not really fitting here)
RB=Regelbunker/?rule bunker?
TR= Trimzelle/trim cell
R= Regelzelle/control cell
hard to say. only saw more detailed plans from TYP VII C and took some ideas there.
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