WILLIAMSTOWN, Mass. Mount Greylock Regional School District officials are working to tweak a memorandum of understanding with the teachers union that allowed the opening of school in September, but it is too soon to say whether those talks will lead to a resumption of in-person instruction. Last week, Mount Greylock went to fully remote learning all three of its schools after the county s 14-day COVID-19 test positivity rate reached 3.01 percent, just north of the 3 percent threshold for remote learning in the September MOA. Superintendent Jason McCandless on Tuesday told the School Committee that he is not overly optimistic that metric will decline when the state Department of Public Health releases new numbers on Thursday evening.