WestudyspectroscopicsignaturesofamonochromaticbosonmodeinteractingwithaT-shapedoublequantumdotcoupledbetweenthemetallicandsuperconductingleads.Focusingonaweakinterdotcoupling,wefindthattheproximityeffecttogetherwiththebosonicmodeareresponsiblefortheseriesofFano-typeresonancesappearingsimultaneouslyatnegativeandpositiveenergies.WeinvestigatetheseinterferometricfeaturesanddiscusstheirinfluenceonthesubgapAndreevconductancetakingintoaccountthecorrelationeffectsdrivenbytheCoulombrepulsion.