[GreenKeys] Teletype LABD 500 Question

[Wa3frp]

I'm working on an LABD 500 that is used in my Western Union Teletype Model 28 ASR i-Telex machine. 
Does anyone happen to have a copy of Teletype Maintenance Bulletin 272B?
Thanks and 73
Russ - WA3FRP
wa3frp at aol.com
i-Telex 834328 WUTMPAM CHIL
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