The text says Sai Baba "attained Lord Vishnu (Chakrapani)". Can you explain the story of how and when this event happened, based on Chapter 36?

The excerpts from Chapter 36 of the Shri Sai Satcharitra make a statement that Sai Baba, "having renounced worldly life, he who attained Lord Vishnu (Chakrapani) has redeemed infinite beings." However, these introductory passages do not provide any narrative details about how or when this spiritual attainment occurred. This phrase is used as part of a poetic description of Sai's spiritual stature and his role as a redeemer. Chapter 36 uses this to highlight his function as a "complete supporter of spiritual goals" without elaborating on the biographical specifics of this particular attainment.