you are right. it has just three sleepers and a single 3a...even pnr records for this train suggests the same...
Accommodation Availability Enquiry
18107 ROU KRPU EXPRES 6-9-2013 ROURKELA KORAPUT * Lower Berth Quota
S.No. Date (DD-MM-YYYY) Class - SL Class -3A
1...
more... 6- 9-2013 AVAILABLE 6 AVAILABLE 2
2 7- 9-2013 AVAILABLE 6 AVAILABLE 2
3 8- 9-2013 AVAILABLE 6 AVAILABLE 2
4 9- 9-2013 AVAILABLE 6 AVAILABLE 2
5 10- 9-2013 AVAILABLE 6 AVAILABLE 2
6 11- 9-2013 AVAILABLE 6 AVAILABLE 2