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i had this happen on my 172. it was the bonnet switch. i had knocked it when fitting an I.K and so when the bonnet was closed the sensor/switch thought it was open still and contuned to beep. (like when you dont shut the door prop).
With mine it was the boot catch, even though the boot catch/lock appeared to be functioning fine at the time.
Unscrewed it to have a look and it broke in two.
Fixed using a standard clio boot catch from a scrappers. 2min job, £3.50. Can't complain.