In 1941, Karl Puchar of Norden carried out restoration work on the organ in a manner that would not now be regarded as good practice. He replaced three ranks of pipes with factory-made pipes. He renewed the pedalboard and added the missing notes, C#, D#, F# and G# in the bass octave of the manual keyboard. In the following years the state of the organ deteriorated noticeably; various assessments were therefore carried out between 1947 and 1954.
