bus 877 to badaling and cable car in north section may not work in march?.

read on tripadvisor reviews that in offseason, bus 877 to badaling and the cable car in north section may not work.

we will be in beijing this march 16-20

does bus 877 ply from deshengmen from 6 am on March 17, 2018?
does the cable car to tower 8 in north section work on March 17?

thanks