How to fix Tube Phono Guitar amp Motorboating Precision Electronics S10

Recently purchased this cool 6BQ5 amp at a radio swap meet. Yes, I planned to repair this amp, however due to unforeseen circumstances, the repair actions were cut short. Unfortunately the cause for the motorboating was due to a damaged output transformer. I may have been slightly taken at the radio sale event, however this amp is related to Western Electric, so I should be able to recover the loss and maybe make a few $$ on the deal after all. I do not plan for this amp to meet its end. It will live on as a fine guitar recording amp. Stay tuned. TD