This work was a joint effort between Julian Bulley, Philip Crowell, Thomas Aldridge, and Lawrence Stofer.

Transcribed from a note inside the organ:
"Holy Trinity Catholic Church - Dayton, Ohio

Organ Repair + leather replacement ---

12/72 - Pedal chests external leather replaced. Swell shutter engine recovered! Rectifier installed.

10/75 - Great chest, upper swell chest, choir melodia chest, leather replaced - polyurethane cloth. Console Combinations - external pneumatics covered - zepher membrane, pedal relay switch pneumatics recovered.

3/79 - Re-recovered upper SW with lighter cloth (blue & red), used different glue (Dow-Corning Urethane Bond) to glue buttons to slick side of cloth, patched bad leather in lower sw. Reglued loose buttons on Gt & Ped with the new glue

8/17/79 - Patched 8 notes - Ch Unda Maris

4/1/80 - Re-leathered Choir Diapason, Dulciana, Unda Maris, New Choir Tremolo, "General" Pistons installed with diodes, Re-Covered Choir bellows corners.

DEC 81 - Patched all bad echo notes, patched SW. Horn Diapason, Bourdon, Patched CH Rohr Flute

84 - New Console - Relay (SS)

Jan 85 - Lower Swell Releathered, Swell Reservoir recovered

May 85 - Echo releathered [NOT VOX HUMANA], Echo Reservoir recovered

Nov 87 - Releathered Choir Clarinet & Rohr Flute"

A picture of this note has been included.

In the 1970s and 1980s work was done to releather parts of the instrument and replace the pneumatic switching with a diode-matrix Solid State Logic control system. The original 3 manual console was replaced in 1984 with a larger 4 manual console. The 4 manual console shell appears to have been made by Klann Organ Supply and was installed by Julian Bulley and Philip Crowell.

The original 1917 console was placed in storage in the 1980s and was removed in 2022 by Nicholas Koch. The console shell was made of quarter sawn white oak, stained dark to match the casework, and had elaborate carvings under the key bed, as was typical of Wangerin consoles. Since the console was stored in an unheated environment, it suffered damage due to weather and rodents. The original console mechanisms, aside from the nameboard and expression pedals, were not present in 2022 and it was presumed that they were disposed of when the console was removed from the church in the 1980s. The keyboards were in extremely rough shape and not restorable. The console carvings however, are in excellent shape and have been preserved for reuse in future restoration work.