The Rebbe commends him for continuing the custom of training students in shechita, an art tied to fear of Heaven. He assures that this role, granted from Above, strengthens his yiras Shamayim. Quoting from Elul teachings, he emphasizes guiding worthy students and expresses confidence in their growth, wishing him nachas, success, health, etc.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/elul/1159