Looked through my stuff and I do have a "Service Manual" for the #29. It's generic with no specific model, issued in 1955.
What is the problem with the unit you have, maybe we can help, or if you wish the same manual is listed on ebay for a reasonable price.
https://www.ebay.com/itm/177807752802?_trksid=p4375194.c102727.m162921
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