I check my Iphone App in Instruments and it’s using 392.00kb of memory which does not decrease and keeps on increasing.
So although I am not using a UITableView there is an entry for [UISectionRowData refreshWithSection:tableView:tableViewRowData:].
Try using HeapShot, see this tutorial by bbum.
Basically in the Allocations instrument click Heapshot, run an iteration of your app, repeat 3 or four times and look for items that are persisting.