Its really hard to get the sound to show itself
my mechanic basically scratched his head as cant get the sound to come on for long enough
Comes on , pretty much under the conditions of :
Sat at a junction , 1st gear , pull away , as the revs rise to 1700 ish get a squeak , lasts about 2 seconds till about 2300 revs then its gone
No drop in performance , really bizarre , seems more evident when the engine is cold , when its up to temp its a bit better
But id rather get it fixed than leave it and let something go pop !