From the Organ Historical Society Organ Atlas 2009 - The City of Cleveland and Northern Ohio:

Homer D. Blanchard of Oberlin believed that the Wirsching Organ Co. of Salem, Ohio rebuilt the Johnson “about the turn of the [last] century,” adding a second manual with three ranks and extending the pedal compass from 13 to 27 notes. The case was extended at the rear by approximately 18” to accommodate the changes. Blanchard further theorized that Wirsching provided a new golden-oak front while retaining the the older, darker case sides, also postulating that what is likely the original Pedal Bourdon chest might have been located at the back of the organ, later moved to one side, with the newer Bourdon extension chest on the other side, thus requiring a wider front. Also, he believed that the Great Diapason was originally a tenor C rank, with a bass provided by Wirsching in the new facade (the facade pipes have 2/9 mouths, while the interior pipes have ¼ mouths). Wirsching provided a new mechanical action and located the Swell behind, not above, the Great.

Little has occurred since. An electric blower was fitted in the late 1920s, and at some point the tenor-C Trumpet disappeared. When the original reservoir leather failed, Blanchard introduced a new reservoir, retaining the 2 ¾” wind pressure. Blanchard’s work was contracted on September 1, 1959. In 1987 James Leek made additional repairs and fitted a new Trumpet on the original slide.

Rebuild of existing Wm. A Johnson organ of 1865, with the addition of three stops to the swell.