Can you summarize the story of how Amir Shakkar's faith was tested by Sai Baba at the Chavadi?

The story from Chapter 22 illustrates a profound test of faith. Amir Shakkar, suffering from rheumatism, sought a cure from Sai Baba. Instead of a tangible remedy, Baba commanded him to stay for nine months in the dilapidated, filthy, and uncomfortable Chavadi. The external conditions were terrible, with dampness, cold, and pests. Baba's medicine was simply His word. Amir's faith was tested as he had to endure this hardship, but he accepted the command, viewing the company of Sai as a great blessing. This unwavering faith and obedience, even in the face of misery, was the core of his prescribed spiritual and physical healing process.