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Is there a way to find out what episode of Happy Days was playing on April 19th, 1977?

On April 19th, 1977, a friend of mine was in an accident that caused him to be parralyzed. The last thing he remembers before passing out was hearing the theme song to Happy Days. Since then he has been able to accomplish more than you can ever imagine. We just came back from a trip to Florida where we were able to ride bikes. He asked for something simple...to see that episode. Does anyone know how we can find out which one it was...it was in rerun state so I couldn't find it through regular channels...no pun intended...

Public Comments

1. It would have to be a rerun as an episode was not being aired that day. Season Four ended two weeks before that date.
2. There is a list of Happy Days episodes on Wikipedia. This is the link: http://en.wikipedia.org/wiki/List_of_Happy_Days_episodes However, there is no episode on April 19. Interestingly enough, on the last episode before that, on March 29, Fonzie is almost killed in a stock car crash. Sorry for not finding the episode, but I hope that the list might help you.