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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Engineer's problem. 6 letters:

STRESS: Engineering problem.
STRESS: Engineer's problem.
STALL: Engine problem
STALL: Jet engine problem
SMOKE: Sign of an engine problem
HUM: Sound engineer's problem
ECHO: Problem for an acoustics engineer