I don't see anything saying which model OFA remote this is. I'm not sure whether all models that take 5 digit EFC numbers are consistent for Audio/1758.

I'm also not sure RemoteMaster support for 5 digit EFCs is good enough yet (I'm using version 1.78) to completely trust. But it's the best tool I have, and I used it to translate all the numbers Dave and Edmund posted here. I selected the URC-8820 as the model of remote and SonyCombo(12/15/20) as the protocol.

Here are the results of that translation:

EFC5 Device Command
08393 ... 48 .... 34
61385 ... 48 ... 125
45001 ... 48 ... 109
07881 ... 48 .... 33
47413 ... 15 ... 110
01845 ... 15 .... 29
01997 ... 16 .... 29

Compare those to the commands listed here:
[Link: hifi-remote.com]

Unless I or RemoteMaster is making a significant error, Edmund's suggestions are for a different Sony device.

Device 15 seems to be a for a MiniDisc. Device 16 seems to be a different Receiver code set (with the same command numbering as device 48).

It does seem from that list that you want command 29, but in device 48. RemoteMaster says that is 65481.