After every flight, pilots fill out a form describing problems that need repair or correction. The mechanics correct the problem and respond what remedial action was taken.
Read some actual logged maintenance complaints and the solution recorded by maintenance engineers.
(P = the problem logged by the pilot.
S = the solution and action taken by the engineers.)
S: Almost replaced left inside main tire.
P: Test flight OK, except auto-land very rough.
S: Auto-land not installed on this aircraft.
P: Something loose in cockpit.
S: Something tightened...