Almost everything you need to know is here in the 700/900 FAQ. And you're welcome, this isn't a chore someone would want to take on without advice. It's regarded as one of the worst chores imaginable with our old 700/900 bricks, both for pros and DIYrs.
https://www.brickboard.com/FAQ/700-900/HeaterCoreReplacement.htm
Please support your brickboard, be it financial or other contributions, including posting back on how you make out.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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