Pneumatic failure rate on real aircraft

As Jim correctly said, the HPSOV valve does have a tendancy to start wearing during operation and i believe that it has had numerous modifications done to increase its reliabillity, in the RW aircraft the HPSOV valve message can appear if the butterfly valve sensing mechanism is worn and is giving erronious messages (could acount for why the data on its faliure is quite large, even though the valve hasnt completely failed but is simply giving a false position)

777Simmer, you are correct about the drive generator oil, Both the Backup Gen and IDG have their own oil systems, the IDG cooed by a Fuel heat exchanger and the BUG cooled with a combination of an OIL/OIL cooler (on fanframe) and a big AIR/OIL cooler on the left side of the engine core. Not sure why people get the excessive oil temp, ive never experienced it, but seems like a common occurence.