pioneer pdp436pe

[terminator2k2]

hi there, i have the above model for repair , fault is

switch set on , reverts back to standby with the red led flashing 7 times (which after looking on the net means a y sustain board fault)

im a bit hesitant to replace this board as i find no s/c ot burnt components.and this board is expensive to keep as a spare incase it isnt this.....

the voltages coming from the power supply seem ok. just wandering if anyone has any experience with this model of set or any ideas what to look for.....

cheers chris