What is confusing me is all the unnecessary capital letters.I'm itching to get my red pen out..
However I persevered and I believe that the OP has a right to be aggrieved if what he has told us is true.The issue of the manager being prejudiced against the engineers is neither here nor there.The fact that he came and finished the job himself and brought another V+ box speaks volumes.
I'm wondering if it was subcontractors doing the job?