The accumulation of moisture at major connectors and control units can cause various ABS/PDAS faults due to corrosion.
Car Problem Reports
Porsche 911 Turbo ABS Light On Due to Moisture and Corrosion
Porsche 911 Turbo Problem
Visitor, 1992 Porsche 911 Turbo, 200,767 mi
ABS light on - found corrosion after having the car in South Carolina monsoons.. it took me awhile though.. you know the connector comes apart and the pins can be removed/replaced, ... Love German engineering...
Oh, the running gear has been rebuilt and the engine rebuilt/upgraded.. so, don't laugh at the mileage. it'll never be a collector so I choose to dirve it..