A list today has been posted on Facebook of 3 months of major line closure for metro. These are listed below. Copied from Facebook and shorted down to the dates

13th to 14th January-South Gosforth to Haymarket 

20th to 21st January Airport to South Gosforth 

27th January Pelaw to South Shields 

10th to 11th February South Gosforth to Wallsend 

17th to 25th February (9days) Airport to Regent Centre 

16th to 17th March Heworth to South Gosforth 

29th March to 1st April (4days) Heworth to South Gosforth