P: proper prefacing the paragraph. remember transitional phrases.
+Arg: The paragraph needs a better or more substantive argument. In general what is written could be said better.
Sx: syntax issues: run-on sentences, sentence fragments, rambling sentences
Relevance: Relevance, some sort of problem with what has been said that needs correction.
Usage: ways in which words are used needs attention.
Grammar: whether sentence construction, punctuation, subject-verb agreement, misplaced modifiers/split Infinitives, mixed construction.
C/D: too many citations and sources, very little discussion, a red flag for plagiarism.
Coll: Too colloquial a style.
Red.: Redundant sentence, the point is too repetitive.
Coherence: there is a problem with the internal thread, sentences are disparate, tackling too much in too little space, the argument doesn't follow, etc.