In a previous experiment we measured the spin wave spectrum of the half-doped bilayer manganite Pr(Ca,Sr)2Mn2O7 in its spin, charge and orbital ordered phase. The data, which extend throughout the Brillouin zone and cover the entire one-magnon spectrum, are described very well by a model of one-dimensional ferromagnetic zig-zag chains that weakly interact to give the CE-type magnetic order. The analysis rules out a widely discussed but somewhat controversial model of strongly bound dimers known as Zener polarons that are relatively weakly interacting. We now propose to extend the measurements into the paramagnetic but still orbitally ordered phase, and above the charge-ordering temperature,to determine if Zener polarons exist in either of these phases.