Trondheim Church, Stained Glass Windows, Johnson

Amazed at the wonderful sharings here about Churches ... wondering if anyone has knowledge of how to find out in which Trondheim church my GGfather built the stained glass windows. His name is Peder Johnson, and there is a painting of the church fathers, along with GGfather, at the back of the church, along with a scroll with his name engraved on it because of his stained glass work in the church. Not much to go on, I know. We have no idea of the time-frame in which he did the work, in 1965 Census his info was: Skoledistrikt Ritsen, Sogn Risen, Prestegjeld Stadsbygd, Gardsnavn Nostbraettingen, b. abt 1828, d. 1885. A now-deceased grandson actually saw the painting of his grandfather hanging in the church, and his name engraved on the scroll, so isn't just family lore. Unfortunately, no details were written down and are now lost. Cousin has upcoming trip to Norway in May, wants to visit and document for rest of family. She is trying through government office somehow, but no luck yet. Any and all suggestions would be appreciated ... (I'm aware there could hardly be any vaguer clues ... a Johnson, a church!!)