1)RDN No:00554,WO No:1027,Qty:34no's.
2)RDN No:00555,WO No:786,Qty:8no's.
3)RDN No:00556,WO No:2549,Qty:1no.
All the above three RDNs refers to the same problem of hardness with the values measuring higher or lower to that of the required values. Hence the root cause, corrective and preventive action are analized and answered as common.