"Old" brighter-fatter kernels exist in /datasets/DC2/repoRun2.2i/CALIB/bfkernels/. Unfortunately, these are in an intermediate format that as far as I can tell, were only ever used in this one place. Reading the kernels is no longer possible with the current stack, as the pickle storage for the kernel attempts to map them to the current style. Hacking with ip_isr and cp_pipe at w.2020.15 (a date I'm reasonably certain had the old code) allows me to access the kernel, and can demonstrate that two randomly selected kernels have identical values. This indicates that there is only one set of kernel values, so constructing new kernels should not be difficult. I've attached the kernel value to this ticket.