The Rebbe sends Pesach blessings and responds to Rabbi Zevin with scholarly clarifications on halachic points, including the meaning of Sheim Havayah, Shehechiyanu on matzah and Mishloach Manot, and interpretations from the Rambam and Tzafnat Paneach.
https://www.torahrecordings.com/rebbe/igroskodesh/015/008/5360