The Pittsburgh Symphony Orchestra is in full red alert mode. The PSO is facing enormous deficits, little community support, and its search for a new managing director appears to be dragging on a bit, even as other major orchestras begin to snatch up promising candidates. Furthermore, the orchestra’s musicians have no input into the search process, which is highly unusual among major orchestras, and no one seems quite sure where the organization is headed. But everyone involved seems to agree that, whomever the PSO settles on as its new chief executive, a major change in the way the orchestra does business is a must.