Hi all,
Where I'm flying, the B737s have APUs from two different manufacturers. Initially we were using the GTCP85s, then changed to APS2000s, then 3 yers back we changed back to the GTCP85s. I do not recall the APS2000s having the auto discharge function. The GTCP85 is definitely fully manual except for the auto shutdown function for low oil pressure, fault, overspeed and fire. No auto discharge...
Rgds...