Ultimately this isn't about the playfield defect. Shit happens and production problems occur. It's about how they are remediating it, which is to say not at all. Well that's not true, they revised the warranty to address this issue, from this (GnR Manual Nov 2020):
What is covered on the game?
Our Bumper to Post“ Limited Warranty” covers every part in your new Jersey Jack Pinball Machine for 90 days from the date of purchase written on your invoice. The LCD monitor will be covered for 1 year from the date of purchase written on your invoice.
To this (GnR Manual May 2021):
What is covered on the game?
Our Limited Warranty covers only the items listed below (“Covered Parts”) from the date the machine is shipped to JJP’s authorized distributors
(or directly to the original owner), for the period of time indicated (the “Warranty Period”):
1. Printed circuit boards (game logic). Warranty Period – Sixty (60) Days.
2. LCD monitor. Warranty Period - Two Hundred Seventy (270) Days.
The optimist in me hopes they are discussing another, less customer-hostile, solution. Also, that JJP won't apply the letter of the law in most cases.