Re-appearance of an assembler CU

If a CU from which valid assembler debug data has been loaded goes away and then reappears (e.g., the load module is deleted and then reloaded), the CU is immediately marked as an assembler CU and the debug data is reloaded from the data set from which it was successfully loaded originally.

You do not need to (and cannot) issue another LDD for that CU because it is already known as an assembler CU and the debug data has already been loaded.