Really need help to use service menu on Panasonic rear projection TV (PT-51HX40B).  Picture is pretty good, but need to find out how to adjust convergence.  Is off slightly as it moves out from center.  Have read other posts that talk about a convergence grid, or series of 9 (or more) "plus" symbols used to set convergence across the screen.  Maybe this slightly older TV does not have either of those.  I can get into service mode (serviceman)...but all I get is a series of letters and numbers in the bottom right.  Have no idea what each of the symbols and numbers are for.

 Does anyone know if this TV has a convergence grid, convergence menu, etc, etc...and if so, how to get to it???