I unfortunately cannot upload a screenshot but just look to the model on the aft superstructure just under the HA 4" mounts are a pair of 3pdrs on each side.
These cannons have been on this ship from the start & have had several reports on the old forum yet just shy of two years now the cannons are still not operational.
When is the likely chance the cannons will become operational and placed in the same binding as the 4" mounts as AA? For they have the same model as other 3pdr batteries on several ships in game that use said cannons as AA as well (Recent example is the Imperial Japanese cruiser Kurama).