"A FESC and MESC the riggers didn't understand and rarely visited." Must have been lazy riggers and how did they change PFCVs without going through the MESC????? As an A & C man i'd rather not be in either though, especially removing a fwd waste tank!!!!
Out of interest what AMM allows an engine change with no runs, i'm sure the RB211 AMM on the TriStar would have listed some of the engine tests?? Even a modern FADEC engine would have an idle leak check!!!