Toras Menachem Vol 7 p140ff Friday 19 MarCheshvan, a summary of the Maamar ViHu Omeid Aleihen and an incredible lesson, about the Rebbe standing over his Shluchim (Malachim). Page 140-41.
Toras Menachem Vol 7 p 153-154. Introduction, the Rebbe RaShaB and the Tzemach Tzedek. The question of the Rebbe RaShaB and the Tzemach Tzedek. Page 153-4.
The lesson from the young Rebbe RaShaB’s request: even those who are lower than the level of Chinuch can insist and demand a revelation from Hashem on the level of Avrohom after he did the Bris and became a master over those aspects of the body that man normally doesn’t control. Page 154-6.
The lesson from the Tzemach Tzedek’s answer: you must earn that revelation by never being finished in terms of growth. Even at 99 there’s where to grow. Page 156-9.