seems like the same problem mate!!!me too. My LCR -04 with 6speed has started to make a weak whining noise in 2nd and 3rd when OFF power. Noise goes away when ON power... weird...
the release bearing is ticking, how lol there not on a fork like the usual setups that can get the kocking/ticking noise as the locators have gone, ive just done a box on the saxo and the guy didnt want to pay for a bearing even tho i advised him and it ticks a bit, but its on his head, centrics hardly go wrong apart from hydraulic leaks so they have done somthing wrong. Could be the dual mass causing it and will turn from a tick to a nock.
mine is the same when slowing in gear or engine braking mines just hit 70 thousand miles on a 53 plate but i got 3 month complementary warranty, but iv only had it 5 days lol great start they best not try none of thiswith me
i think the 3rd gear whine is a common thing on most 6 speed boxes we have many people asking about them there probs is fix but most leave it as it is. including me mine does it all the same.
i know people have changed the oil and still the same problem of the noise