Pics to illustrate what I need to source for replacement!!
Maybe Andersen brand? Others in our building are, this one I don't see a brand name on. Numbers are for what I can access.
Operator base mechanism # C-9400-1; crank arm # 136158ST (A?) + 1361356WH (below upper #, not entirely legible); operator arm # 1521101.
I have pictures I can send you if those would help!!