Hi Bill,
Yes, I can provide you with photocopies of the original Philco service bulletin and info for your Model 18, Code 123. Go to my website, The Philco Repair Bench at: http://members.aol.com/caschwark and click on the SERVICE INFORMATION link. Just fill in the email order form. My typical info pack includes: schematic, parts list, chassis diagram(s), voltages, alignment instructions, and (where appicable) production changes notes, pushbutton adjustments and phono service info on radio-phono models.
Chuck