Had one nest built inside the blower motor and had the motor locked up. Had to put a wrench on the shaft to crunch it up. Had a whole house unit set in the attic for 15 years and it took hours to reclaim it when the central unit failed with an empty bank account. That was in 2005 and the bank account is still empty and the 1987 Sears 25,000 BTU unit is still humming by the way as I type. :)
The 1992 units on the MH tested fine on a recent generator run. The pre 1995 units seem to run forever.