Glad you know how messy SMRTB deployment is. Need 2 to 3 mths to
confirm their statuses like SBST....
SBST is straight away a perm sticker.
I am not sure if 1 of 178 splits acts as spare. Very X-ed, I
didn't know (178) S101 and S102 swapped slots until
somewhere last week. Additonal runtime (wef last week) will
means that 654X calling quits in WL first, 639R going last from WL,
638T to call at my side.
Perhaps I should add in SG wiki that one 178 S-shift perm
acts as spare though, in order not to let others be confused.
And also please do not remove, because this is indeed the case
for 178.