Hi tech systems with their seemingly endless capabilities are in many ways like living breathing animals.
They need a lot of attention and proper adjustment at their birth. They grow to meet changing needs, develop aches and pains that need to be found and fixed.
All this needs to be done while keeping mission critical system integrity and reliability intact. Quite often good detective work is required to locate the true causes of symptoms.
Problems thought to be on thing like speaker buzz, might really be caused by something completely different like improper power distribution.