I don't have the EPROM you need but you might be able to bid on the TLS-5
unit on EBay and clone the EPROM from it if they are actually the same
model. Two different TLS-5 models are listed for sale as of today with
widely different prices, so far.
http://search.ebay.com/Teltone-TLS-5-Simulator_W0QQdfspZ32QQfromZR40QQsatitleZTeltoneQ20TLSQ2d5Q20SimulatorQQssPageNameZRC0024QQ_trksidZp1638Q2em120
One long url or just do a search on EBay for "Teltone TLS-5" with out the
quote marks.