Gas Chain Troubles: Simmer Only

I'm trying to assist a friend of mine to troubleshoot his gas train. He has a Maxitrol RV53 and a Honeywell V88A, they are hooked up to Baso L62AA-5 Safetys.

• The pilot is lit.
• All the flutes have a small blue flame upon call for heat. The emphasis on SMALL.
• I have opened the Maixtrol cap and tightened down on the "PLATED" spring, --- no change.
• I have checked the voltage at the solenoid on the V88A .. 24VAC
• I have removed the bleed valve tubing on the V88A .. --- no change
• The solenoid is very WARM to the touch
• I do hear the audible click of the solenoid at call for heat.
• I have NOT put a manometer on the line.

We are going to 1st attempt to replace the solenoid as that seems to be least invasive. Last season, this was a roaring beast, now, a small simmer. Pictures are here: https://photos.app.goo.gl/k5kTvmjuqrLfuz7VA Documentation is here: V88A: https://s3.amazonaws.com/s3.supplyhouse.com/product_files/V48A,F,J,V88A,J-User6.pdf L62AA: https://s3.amazonaws.com/s3.supplyhouse.com/product_files/L62AA-5C%20-%20Use.pdf Maxitrol: https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Maxitrol-RV53-1-Brochure.pdf Any thoughts? THANKS