Chris,

 

Sounds good, but in the mix of things, some, such as myself, have not experienced the lockups but have another fluid imbalance condition.  To wit, when gear down is selected the nose gear air spring and the door springs compete to cause a high speed transfer of gobs of fluid from the HI side to the LO side.  Sometime the door springs are deprived of enough fluid, quickly and the nose gear door is not quite open when the  nose wheel comes out - thus, curved scratches on the nose gear door as it is pushed out of the way.  The cause may have the same basis as the condition you describe - some sort of transfer inadequacy thru the pump.  When was the last time you checked the strength of the nose gear gas spring by seeing if it takes a 25 # push against the nose wheel to get it up or the emergency drop test?  Anyway, just a component to think about - Can the rapid extension of the nose gear (as pushed by the spring) cause a pressure problem in the "spool" valve in the pump?