seatbelt buzzer maybe?
does it have a wired in seatbelt?
generally a seatbelt buzzer will time out after 30 seconds or so but you never know.
any lights on on the dash indicating what might be wrong?
LED hourmeter display? showing any error codes?
there a seatswitch circuit?
hows the engine oil pressure? low oil pressure alarm?
it have a hydraulic oil flow sensor on the filter? low hyd oil flow maybe?
just some things to think about checking...
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