Kevin did you ever find a service manual for it ? send me a pdf copy if you have and ill have a look at what is connected to those functions.
It could be just a relay or dodgy switch try switch cleaner on all swithces and relays if it has any
Check that when you press play the relays click in
Check if there are any internal fuses
Alan
Turntable - Garrard 401/Jelco 750L/Ortofon Kontrapunkt B, Pioneer PLC 590, Micro Sieki MA505 , Denon DL103R - DIY Paradise Phono stage - Reel 2 Reel Studer A810, Otari MX55,Tascam BR20, Revox A77, B77, PR99, TEAC X1000 & 3440, Digital HTPC / Young Dac - Preamp - DIY B4, 821, Power Amp's DIY Avondale NCC300 Mono Block, Speakers Wilmslow Kit Volt BM220.8 / Scanspeak D2905/9500