transmission problem (clatter sound...)

[RafRaf]

I'm moving my MAC thread here to get more inputs...

Background:
GSL Diesel 2004 (prior the latest Adventure upgrade) - so Seth is a little over a year only (or 25000Km old). Regular PMS.

Problem:
Clatter/rattle sound on cold start from the transmission. The sound goes away temporarily when I step on the clutch. The sound goes away after some time or when I step on the clutch a couple of times or if I move the stick a bit in nuetral. The sound is not present when gear is engaged and moving.

Update:
1. I saw sign of re-occurence of leak at my transimissions rear part (casa supposedly had replaced gasket during 25K PMS). Pictures attached.
2. I noticed it is louder when on an incline.