Conversation so far:
What is Hardcore 81?
their second album Hardcore '81.
What are some of the songs on the album?
CANNOTANSWER.
How was the album received?
the record's title and its extensive North American promotional tour is sometimes credited with popularizing the term "hardcore punk".
Who were the members of the band for this album?
Randy Rampage was fired from the band on January 1, 1982 and was replaced by ex-Skulls drummer Dimwit on bass.
Who else was in the band?
Dimwit switched back to drums and Subhumans singer Wimpy Roy was hired as the new bass player and second singer, leaving Keithley as the only remaining original member.
Were there other changes to the band's members?
the band's lineup changes continued after Let's Wreck the Party, with Dimwit replaced by Kerr Belliveau.
Belliveau stayed only three weeks.
Why was Belliveau there for only 3 weeks?
CANNOTANSWER.
Are there any other notables changes to the band?
Dave Gregg quit in 1988 after D.O.A.
fired their manager Ken Lester, to which he was very close.

Question: Who replaced them?
Self-contained rewrite: Who replaced Dave Gregg in D.O.A.?