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22.04.2007: Finished
After the sealant dried up, I installed the valve on the car and found it fully functional! This proves that at least some BPCs can be repaired.

The boost pressure control valve (BPC), also known as the APC solenoid valve, is used on most Saab engines to control the turbo charging pressure. The valves on Trionic5 models are often prone to failure. In some cases it just needs a good cleaning, but sometimes it becomes permanently stuck in one position, causing the car to either stay on base boost, or go into overboost until it hits the fuel cut. This article provides an insight on what could be casing these permanent faliures.

 

 
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