Are there codes available for Arcam DVD dv137? And are there discrete power on and off codes for available for components in Aracms diva line of products.

try these
power on: 0000 0073 0000 000B 0040 0020 0020 0040 0020 0020 0040 0020 0020 0040 0020 0020 0020 0020 0020 0020 0040 0040 0020 0020 0020 0CA4
power off: 0000 0073 0000 000B 0040 0020 0020 0040 0020 0020 0040 0020 0020 0040 0020 0020 0020 0020 0020 0020 0020 0020 0040 0020 0020 0CC4

All Arcam owner's manuals have remote codes in them. The DV137 is on page 23 ([Link: arcam.co.uk]). You need MakeHex to convert those codes to Hex ([Link: remotecentral.com] - The ReadMe.txt tells you how it works).

Use the rc5.irp: Device=25 (system code) and Function= whatever you need (after the dash in the Decimal Code, ie 25-1, 1 being the Function).