Part #612919
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger/764331 diagram
Part #600587
Heat exchanger/764331 diagram
Part #613209
Heat exchanger/764331 diagram
Part #613531
Replaced by #12910
Furnace body diagram
Part #613839
Replaced by #3L05-1
Damper assembly diagram
Part #604636
Replaced by #604967
Control box diagram
Part #611872
Heat exchanger/764331 diagram
Part #96839
Heat exchanger/764331 diagram
Part #89726
Control box diagram
Part #612254