This is typical Bryston service, but of course that's no reason to take it for granted. I've been using the same Bryston 4B amplifier on the bass towers of my Infinity IRS system since I bought the system new around 1990 or so. It has been serviced at Bryston a few times over the decades, always done expediently and at a modest price. Never any drama. Compare that to the recent experience of others here with established companies - Benchmark refused to examine an ADC that was only five years old. MoFi wouldn't examine an $11,000 phono cartridge that was about a year old.
The Bryston 4B replaced a Bryston 3B in my system. I sold the 3B to a friend and last I checked he was still happily using it.