The airplane's out-of-trim condition became worse as the crew attempted to diagnose or correct the problem, ... The crew had difficulty controlling the airplane's tendency to pitch nose down. The airplane descended, but the crew was able to (stop) the descent.  -   Jim Hall     Quotes
The airplane's out-of-trim condition became worse as the crew attempted to diagnose or correct the problem, ... The crew had difficulty controlling the airplane's tendency to pitch nose down. The airplane descended, but the crew was able to (stop) the descent. Jim Hall