Oh, may I too late to reply?
Our loctaion is at the end of "car road ". The "car road" I mean is start from AFCD warden post, going uphill, turning left at Shing Mun junction and passing by the fire lookout. It finally cut across the yellow trail and we were about there.
If you walk from the main access road, you can turn left to the uphill trail which you can reach yellow and brown forest walks and finally the "car road". The road is actually runs along a ridge and the bird was at the eastern slope on 8 Sept morning.
However, we didn't hear the bird on previous Sat (1 Sept) at same location and same time.
Gary