"Our 200s did not have a switch inhibiting deplyment of O2 masks."
So the cabin altitude trigger point for mask deployment was greater than the baro alt of La Paz?
"APU provides bleed air to keep cabin alt below 14000 ft."
Would this be the trigger point? I ask this because a typical 747-400, for example, has a trigger point between approx 13,250 and 14,500', and La Paz is about 13,300', so would not be able to fly into this airport (even if the runway was long enough). I'm not even sure that the 747-400 APU could provide sufficient bleed air at this altitude to maintain cabin pressure (Especially when you started opening cabin doors for passenger embarkation
).
Did you also have automatic emergency decompression PA announcements on the 737-200?
Thanks,
Rgds.
Q.