I had the latest flash done last summer and it has been good since. Towed the GC on a number of trips and it popped in and out of Neutral with no issues.
However I DO still carry the non-N23 FDCM with me, just in case...
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles