list of parts replaced 7 years ago:
amp board (awh-030)
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12
C1, C2, C3, C4, C5, C6, C11, C12
protection board (awm-062)
Q1, Q2, Q3, Q4, Q5, Q6, Q7
C1, C2, C3, C4, C5, C6
1n4004 diode across pins 9 and 10
control amp bd (awg-027)
Q1, Q2, Q3, Q4...