Unfortunately winter is the worst time to analyze turf. The plants are not putting out new leaves and the sun is low and not encouraging the existing leaves to remain viable food producers. If the leaves have turned to a green slime in spots, you should remove this and any other organic debris that may be decomposing as this robs nutrients from the soil. If you applied a fall/winter blend fertilizer in or around November, then the roots will have the food they need to grow and develop over the winter for a nice spring growth spurt, and that is the best hope. As soon as the sun hits and soil gets above 50 degrees the plants will come out of dormancy and begin making leaves again. A high nitrogen fertilizer application should be applied at this time. After the first 2 mowings you will see where dieback has occurred (if any) and where spot seeding may be called for. All turf grasses need at least 3 hours of direct sunlight (or 5-6 hours of filtered sun) per day to be aggressively healthy. The tall fescue in Water Warden (the cultivar you have) is your best bet for survival with minimal sun. WW is also drought tolerant so be careful not to over water, especially since you have the clay soils. By the end of April we should be able to tell what condition the lawn is in and the weather will be warm enough to take remedial action if called for.