Blimey, that's digging up a relic, cannot remember that far back but I believe the code I posted should be correct, If I remember correctly LD is only used on it's own if it is the start of the ladder, If there are two contacts in the OR function then it becomes LD x AND y OR LD
But just one contact ORed around many contacts is still just an OR.
Actually I just tried it on a Mitsubishi & the mnemonic code is as I posted.