Those spots do not look very bad. It is not an emergency.
Look for spider mites when you see spots on Phrags. I do not think this is the problem now.
Spots on Phrags. may be caused by water with high mineral content. Spots may be caused by not enough water. Spots may be caused by too high or too low temperature.
This is an older growth that flowered. A Phrag. growth that flowered will eventually produce one or more new growths, then die. The spots may be the natural aging of the leaf.
__________________ May the bridges I've burned light my way.