Report the Indications, Not the Problem
As pilots it is easy to diagnose the problem and tell a mechanic with certainty what is wrong. Sometimes the problem is obvious but often the cause it not so clear. Modern aircraft, even light sport airplanes, are very complicated machines with interconnected sensors, relays and indicators. Write up the discrepancy with as much DATA as possible and save the conjecture for a bet with a friend. Pictures are worth a thousand words so if possible, snap a couple of photos of the indications to include with the write-up.
Here are examples of poor and good write-ups:
Poor: Autopilot does not work.
Good: Autopilot tested normal before takeoff using recommended procedure. While intercepting localizer course at a 30-degree angle in heading mode with the nav armed, the airplane turned at a 20 degree angle of bank away from the localizer course. Heading bug was not changed during deviation. Autopilot did same thing when intercepting VOR radial, also intercepting at a 40-degree angle. No error annunciators shown.
Poor: Flight Display flickers after takeoff.
Good: After takeoff climbing through 400 feet at 70 knots; airspeed, altitude and rate of climb information replaced with red X's. Upon reaching safe altitude referenced abnormal checklist and reset circuit breaker per procedure. X's disappeared and continued working normally for remainder of flight.
Poor: Oil pressure gauge broken.
Good: Engine indications normal during start and run-up. Shortly after takeoff oil pressure began slowly decreasing and annunciator illuminated. Flew normal pattern for return to field during which all other indications including oil temperature remained normal. After parking the oil quantity indicated 6 quarts (same as on preflight) and there were no obvious leaks in or around the engine cowl.
Last thing to remember is ALWAYS FLY THE AIRPLANE. Do not let yourself become distracted by abnormal issues that you lose situational awareness or control. Enlist passengers to assist with checklists and troubleshooting but no matter what the problem - flying the airplane always comes first!