Drying out desiccators
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The electronics units are sealed boxes fitted with desiccators. These absorb the small amount of moisture that, despite the sealing, eventually penetrates the units.
If the windows of the desiccators show pink then they must be changed. Spares are supplied, so fit the spare and dry the old desiccator.
To do this, place it in an oven at 120°- 150° C for approximately 1 hour, after which time the window should show blue. Place it in a sealed bag, and store it in a sealed canister for future use. The metal cans in which the desiccators are supplied are suitable containers, with sealing tape applied to the join between the lid and can.
Desiccators can be dried many times before their effectiveness is impaired.