There was a block and it was managed well...It was asymptomatic.
There are both theoretical and practical considerations against combat training -
It is not possible to say whether there is another - it is nearly two years from the first...
strains the heart - isotonic like jogging is good
is a possibility in boxing - not always external and easily detectable
With a family history and a proved, treated block - I suggest to AVOID combat training...
Why are you particular? - if it is not your profession?
Is it not better be safe than sorry?
Of course, some may like to differ - but I am against it