Captain......
Yep there is a loss due to differential Piston size...Retract uses more fluid then extend and you r right in stating there is no evidence of transfer due to the "Resivoir overflow" being in the airstream.(double pipe drain behind the wheel well the other is or the APU supply line couplers) The tell tale "dolls eye"is in the forward electronics bay,right hand side, front one for LGTV operation ..