I'm sorry to hear about your engine and getting water into the block from flushing. Was it from flushing the motor while it was tilted up somewhat above regular the trim angle?
Evinrude is closed for the holidays until after the new year.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.
Can you follow up with BRP when they open back up on when the backordered powerhead will come in? My service manager reached out to me on Tuesday and said he still doesn't have a date from BRP when it will be delivered to them.