In the discussion of classifications of Dharmas, the lecture notes reference the three asamskrta dharmas of the Sarvastivadins.
Curious about the two types of nirodha, I found the following definition in the Princeton Dictionary of Buddhism:
Two types of nirodha are described in ABHIDHARMA literature. PRATYSAMKHYANIRODHA, or “analytical cessation” refers to a cessation that occurs as a result of meditative analysis of the real nature of phenomena: it is one of the uncompounded factors (ASAMSKRTADHARMA) recognized in both the SARVASTIVADA-VAIBHASIKA and YOGACARA schools. APRATYSAMKHYANIRODHA, or “nonanalytical cessation” refers to a mere absence, such as the temporary absence of hunger after a meal, or to an uncompounded factor (asamskrtadharma) that suppresses the production of all other dharmas, ensuring that they are restrained from ever again arising in the present.
Kathavatthu 2.21
This point is raised at the end of the second chapter of the Kathavatthu.
Are there two kinds of ‘cessation’ (nirodha)? The Mahiís. and Andh. believed that there are, namely a ‘cessation through reflection’ (patisankhá-nirodha) and a ‘cessation without reflection’ (apatisankhá-nirodha). The former is the deliberately effected final cessation, i.e. Nibbána; the second is the natural momentary cessation of conditioned phenomena. Both appear as ‘uncreated elements’ (asaòkhata-dhammá) in the Sarvastivádins’ list of dharmas.
Here the 'heresy' is recorded without refutation.
Nyanatiloka Mahathera's Guide to the Abhidhamma Pitaka available here.