small red lights flash on my Nakamichi PA-7


First time on this forum.
Just bought a used Nakamichi PA-7 power amp. Everything seems fine, music sounds great, but sometimes the small red lights on the front of the amp blink or stay on for a second. What does this mean? Any suggestions on where/how to find an owners manual for this unit.
Thanks
Joe Sullivan
joestoy
No sweat Swamp , if you dish it out need to take it too. Life is hard.Wolf really is buried in Vienna right next to Brahms who is
buried right next to Schubert

Just a comment Wolf, didn't think you were.
THANKS TO EVERYONE, some very interesting info for me to use. The speakers are Vienna Acoustics' Baby Grands, my brother-in-law didn't use and sold them to me.
Any ideas on where/how to find operating manuals for the Nakamichi PA-7 and CA-5.
I was playing very loud Highlands Cathedral, a combination of brass, bagpipes and organ.
Again thanks to everyone.
Joe