I broke down and messaged him tonight. He responded and said he is having a rough recovery but signs are good for the future. He thinks it will be months before he is fully functional.
I no longer have the vinyl, but do have "Burning Spears" on cd. That disc says Produced and recorded by Lester Koenig. John Koenig is on Facebook - try contacting him there.
If I didn't mention it earlier, I took a CTA bus ride with Bob and Albert Grossman to a club in Chicago's "Old Town" around 1966.
edit to say he mumbled in my ear for the whole ride and I didn't understand anything.