You do not need to diagnose the instrument. Just describe what it is doing and what changed.
InstrumentMake, model, acoustic, electric, bass, amp or pedal.
SymptomBuzzing, high action, tuning trouble, dead note, noise, crack, loose part.
Setup detailsTuning, string gauge and how you normally play it.
Recent changesNew strings, travel, humidity, fall, pickup swap, storage, weather.
PhotosUseful for cracks, bridge lift, hardware, wiring and visible damage.
DeadlineGig, session, gift, sale or no rush.