Update
Just got back down to Joburg. Flew paid 1st IAD - ZRH - FRA - JNB, all UA flight numbers, even though ZRH - FRA - JNB was on LH metal.
It happened again:
L# 0572 F Class FRA to JNB 5,248 7,872 13,120
SO...base was 5,248, bonus was 7.872, total 13k.
I'm not sure what happend for ZRH - FRA as that still hasn't shown up, yet.
Also, I still have no idea what L# stands for, and it looks like none of us does. However, if you have status at UA and fly LH down to JNB, it may be worth your while to book that segment with the UA flight #.
Will