Kova, since replacement must come at no cost for you i wonder why you would not try? if i would be you i would and waiting a few weeks to get fine product makes sense to me.
H20, interesting findings about output 2. i tried this once but my EB50 did not sound good with it ... however i do not remember noise or hiss issues with it... will try it again out of curiousity.
i also do not see a big problem to exchange a 90$ amp if there is no additional cost involved. paying postal one way won't be overly expensive. from my experience sending from Austria to HK with insurance cost me 15 euros and Austria is by far not the cheapest country especially in what concerns services is one of most expensive one.
H20, i see you again changed your conclusive signature to Ck4+, so where is Rocoo BA now?