Pulsed ESR is used for microscopic imaging of the conduction electron spin dynamics in the organic crystal (FA)(2)PF6. Previous conductivity and X-ray measurements of this crystal show a Peierls transition at 180 K. The 'local' diffusion measurements reveal that the spins diffuse freely far from the crystal boundaries. This enables the extraction of the free diffusion coefficient by a one-parametric fit. The temperature dependence of the diffusion coefficient was found to correlate with a previously reported structural transition occurring well above the Peierls transition. (C) 2003 Elsevier B.V. All rights reserved.