While I'm NOT suggesting you DIY it.. But as a guy who did some stained glass work 50 years ago as a hobby, side income... It really isn't all THAT hard. Put word out (craigslist?) looking for someone who has done stained glass work. (And see some of their work, don't just take their word that they can do it!) Or just find a repair shop that does them. As others have said, nice door/entryway. It deserves to get fixed, not swapped out for some ugly door/window.