Any permanent damage to amp?

I believe I am a bit paranoid....
I am continuing the other thread of speaker cable hear, close the other one
I was using a wrong setup-instrument cable from amp to head
Nowa friend rem,inded me of one time when he was testing the rig there was a noise (like a horn of a train-not so loud) and a paff sound, the amp turned off....perhaps it was for using the instrument cable...It wasn important for me at that moment, was lucky.....and an instant later the GK was working like before
Now i am using speaker cable from head to cab and instrument cable from the amp to the compressor. The rig is sounding better than when I was using the bad cable.
It seems to play normally now through the bass cab, sounds like it always has, but what happened? Did I likely do any permanent damage? Perhaps weaken some components in the amp?
It worth the time carrying the amp to a sound tech??
pd:I carried the amp and the cabs to a sound tech after this episode because the hartke cab was making a vibrating sound and he told me all was okay, only I had to adjust the screws
Thanks, and sorry if I am annoying and tedious