I'm sure you know what you wanted to say, but I'm definitely not sure I do!
No, unless you want to test whether the fuses work.
So you have removed the outputs on both sides, i.e. TR11+13 and TR12-14?
You can simulate the B-E junction of each by installing a silicon diode (e.g. 1N400x) in its place, orientation following the arrow in the respective transistor symbol (i.e. anode towards base for npn and anode towards emitter for pnp).
Have you already checked the usual collateral damage? R37/39, R33/35, TR07/09, C05, the feedback side of IC01 (2SA798s are known to fail quite commonly even without any traumatic events)?
You could call the AU-2900 an "accidentally excellent" amp - in wrestling with its modest power supply regulation, they pretty much bulletproofed the preamp circuitry against any supply noise as well. (3900 and 4900 are much the same, but the 5900 had some real issues due to its reliance on a "real" regulator that wasn't too quiet.)
BTW, they never show the value of R57 (R58) in the preamp - mind having a look what it is?
The one thing that this amp (sadly) does not have is output inductors. I would consider winding some, with maybe 4.7 ohms in parallel (often inside).
EDIT: I did notice one issue, the Switch Circuit Board (F-2556) is a maze of ground loops. I would suggest a number of strategically placed cuts, roughly like this: