Nobby,
It's a mechanical noise from the keys itself. It does not affect the sound from the speakers. When my warranty is out I'll break it open and take a look for myself. I'm very excited about the PSR-2000. It's no PSR-3000, but still a damn good arranger.

Squeaks
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.