The Rebbe reassures the recipient about their health, advising them to follow medical guidance without worry. He emphasizes strengthening daily study of Chumash with Rashi, Tehillim, and Tanya, along with reviewing the Previous Rebbe’s maamarim or sichos before sleep. He mentions praying for them at the Ohel and awaits good news.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/teves/856