ACL readvar command issue

I'm currently working with Arbortext 7.0 M010 and am having an issue with one of my ACL scripts. I'm receiving an "Unexpected argument:\" error on the readvar line. I've read back through the documentation and all looks correct. This same script works fine in Arbortext 6.0.  Any thoughts would be greatly appreciated.

SNIPPET:

function translateImm()
{
require comp_usingxsl;

require compose;
$dir = doc_type_dir(current_doc());

readvar -title 'IMM Translation'\
  -prompt 'Select the Section to Translate:'\
  -choice 'Maintenance'\
   maint\
  -choice 'Illustrated Parts Breakdown'\
   ipb\
  -choice 'Wiring Diagrams'\
   wire\

....

}