No signal from BSKSA on 17785

SAUDI ARABIA   On August 7 no signal from BSKSA:
0800-0957 on 17785 RIY 500 kW / 270 deg to WCAf French Radio Riyadh
All other frequencies of BSKSA are on the air:
till 0857 on 15380 RIY 500 kW / 310 deg to N/ME Arabic Holy Qur'an Sce
till 0857 on 17730 RIY 500 kW / 295 deg to NEAf Arabic General Program
till 0857 on 17740 RIY 500 kW / 310 deg to WeEu Arabic General Program
till 0957 on  9715vRIY 100 kW / non-dir to N/ME Arabic Holy Qur'an Sce
from 0900 on 11935 RIY 500 kW / 310 deg to N/ME Arabic Holy Qur'an Sce
from 0900 on 15490 RIY 500 kW / 310 deg to WeEu Arabic General Program
from 0900 on 17570 RIY 500 kW / 070 deg to SEAs Arabic Holy Qur'an Sce
from 0900 on 17615 RIY 500 kW / 100 deg to SEAs Arabic Holy Qur'an Sce
from 0900 on 17805 RIY 500 kW / 295 deg to NEAf Arabic General Program
from 0900 on 21670 RIY 500 kW / 100 deg to SEAs Indonesian