In article ,
"H. P. Friedrichs" wrote:

[...]

I was left to wonder how it
is that, without the benefit of factory training, documentation, or
diagnostic equipment I could troubleshoot and repair the problem when
the dealership could not....

Depends heavily on the tech who looks at it. I was handed a truck a
couple of weeks ago that someone had spent all day trying to
troubleshoot. No cruise control, no Jake brakes. He'd thrashed around
for eight hours, running diagnostics, checking sensors, even popped the
valve covers to check the brake solenoids.
I found the broken clutch pedal return spring in less than a minute.
$12 part, five minutes to install.

--
B.B. --I am not a goat! thegoat4 at airmail dot net