I thought 712A went to Precision National and that 715A was P&C Dock 1 and 715B was P&C Dock 2? So far from what Ive seen the following engines had tubes on them at some point-P&C Dock 1 and 2 (whatever BLE units they were)-715B 716B 718A 721A 722A 725A. One reason that its hard to notice those tubes is that on some engines the tubes were painted to match the paint scheme(where the tube went over orange it was orange) however on some engines the entire tube was solid black and sticks out against the orange (or yellow) paint. For instance the photo I first asked about with 721A the tubes were solid black-however look here at 722A which had the tubes painted to match the paint scheme.
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