First & foremost for a Piano Tuner to tune a piano , the Action & Keyboard need to be in good working order. In other words it needs to be free of any technicals defects. It is the responsibility of the Piano Tuner / Technician to keep the Client informed of the status of the piano & its importance to have them fixed
This means :
* There could be stick notes , notes that are not responding properly. This can be due to dampness (generally a piano need to be placed to a interior wall, avoid an exterior wall as much as possible
* The Action & Keyboard can have a great amount wear and tear. This can be a great obstacle to tune a piano.