What challenge did Das Ganu face while working on the Ishavasya Upanishad, and what was Sai Baba's initial advice as told in Chapter 20?

According to Chapter 20, Das Ganu undertook the task of creating a simple Marathi commentary on the Ishavasya Upanishad, titled "Ishavasya-Bhavartha-Bodhini." Although he managed a word-for-word translation, he struggled to grasp the deeper, internal secret of the scripture, and his mind found no joy or satisfaction. Faced with this profound doubt, he traveled to Shirdi to seek guidance from his Satguru, Sai Baba. The chapter recounts that upon hearing his predicament, Baba gave him a cryptic instruction, stating, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house When you return there."