Zen and the art of refrigeration repair
Even though ther is alot of science to this job, it's an art to do this job.
You find that each service call may, at the surface, to be the same but its not. Almost as if if unit that you work on has its own personality. Wear and tear to the comperessor is different effecting its effiency. location in the unit is different, next to the grill, outside, it's all each different.
Ask yourself, "do I fell good about this charge?"
The anwser is with in yourself Grasshopper.
'The road to enlitenment is long and difficult,, make sure to have pluty of beer and porn for the trip.'