Screen door 'string' broken - door is taped in open position - what are our options?

Yes, the screen door can be repaired--though some here would consider you crazy for attempting it! :-)

It does require some thoughtful planning and careful attention to detail.. I've restrung mine twice, and a third time is pending. At present my bottom string is broken within the screen, but the effect on door operation is minimal so I've been procrastinating.

Do a search for "screen door" and you'll find several relevant discussions. Look them over and if it's something you want to tackle please chime in with any questions.

Removing and replacing the door unit is simple. Remove two screws in the upper corner and two more buried in the lower track. Then you can pull the entire frame up and away from the wall.. You will need to do this regardless of whether you repair or replace the door.

Ah, yes—if the string at the very bottom (the one that runs in the track) broke, than the door is useless since that tensions the entire upper half of the screen.

If it broke close the the adjustable anchor that runs in the track, you might be able to slide the anchor over and reattach the string.

I'm not aware of anything on YouTube, but if you find something please report back!