749 Coolant Leak

I am in the process of prepping my 749R trackbike for the coming season.
I noticed a small puddle of coolant under the bike.
The bike hasn’t been run since last September.
Closer inspection revealed that it appears to be weeping from the water pump housing, around the aft edge where it joins the side casing.

I intend to take it off and re-seal it with 3 Bond.

Anybody else had this happen? Seems weird that it has leaked when it has just been sitting there doing nothing.

 

Arrow shows the location plus blatant excuse to show my R’s(e)!

 

It’s not coming from the drain plug. It’s further aft than that, along the curved rear edge.

 

Here you go. Coolant is greenish, resting along the curve in the casing.

 

Took pump cover off and sealed it with new 3 Bond.
Hopefully this will sort it - waiting for sealant to cure before filling again.