I took the rear plugs out earlier today (NZ time) and they looked pretty awful and wet with moisture.
Althought its been kept hangared it seems the extreme rain we've had this last week must have caused a lot of condensation.
Cleaned them and heated them on a stove to dry them. Then put them back and its back to life again.
Thanks to all who have contributed.
I am in an environment with little knowledge of the 47 since the NZ 47 population was written off in the deer recovery period 20 or more years back.
Thanks again,
OOW