Found an accumulator, got it installed. Flushed the brakes, got nice clean fluid now.
Good brake response, took 9 pumps to get the pedal down, much better than before.
Brake warning lamp now functions normally, but I still have Anti-Lock warning light.
Pump runs as normally expected.
Looking for the MST-6400 tester now.
Any suggestions on my next step if I can't find a tester?
Thanks for your help.