I changed the names on a switch(SW1) in the C1:PSL-FSS screen. To do this I had to edit the psl.db database file in the directory /cvs/cds/caltech/target/c1psl. After this change, when I executed this screen, all fields in the C1PSL_FSS screen went blank. As the change to database file takes effect only after we restart the C1PSL machine (slow machine) I went ahead and reset the c1psl machine. I then used the burttoday to locate the most recent snapshot files and then used burtgooey to restore all the values in the c1psl.snap file.
Everything back to normal now.