As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH LIGHT SWITCH IN DIM AND OFFSET INL COURSE THE "OFST" LIGHT BLINKS OFF/ON WITH STEADY BEAT. IF "EXEC" BUTTON LIGHT BEHAVES SAME. CAPT FMC ONLY. GROUNDED - YES. UNABLE TO DUPLICATE "OFST" AND "EXEC" BUTTON BLINKING. PERFORMED CDU LAMP TEST PER AMM 34-61-01-710-801. OPS CHECK GOOD.